Biology B - For Primavera workbooks
Exam Questions with Complete Answers
which statement is true about model organisms ? - Answer-they help scientists
understand biological processes
Read the statement :
When Mendel crossed a purple-flowered pea plant with a white-flowered pea plant , the
offspring were always X . When Mendel crossed the offspring with each other , the
distribution was about Y purple and Z white . The more experiments Mendel did with
pea plants , the closer they approached these percentages .
Which option correctly replaces X , Y , and Z in the statement ? - Answer-x : purple
y : 75%
z : 25%
A pea plant that is tall has a dominant trait . Which statements are true about the
genotype / phenotype relationship of the plant ?
Select all that apply . - Answer-- The genotype Tt always results in a phenotype that is
tall .
- When the phenotype is tall , the genotype can either be TT or Tt .
What statement would be true according to the theory of blending inheritance ? -
Answer-The offspring of a tall parent plant and a short parent plant will all have a height
in the middle .
Mendel crossed a tall pea plant with a short pea plant . All the offspring in the first
generation were tall pea plants .
How did Mendel explain why all the offspring were tall pea plants ? - Answer-Two
factors affect the height trait of pea plants . One of the factors is dominant over the other
.
In some situations , when two purple-flowered pea plants reproduce , the offspring can
have purple or white flowers . When this experiment is run repeatedly , it is discovered
that three-fourths of the offspring have purple flowers and one-fourth of the offspring
have white flowers .
What would happen if this experiment were run only once ? - Answer-The experiment
would result in a plant with either purple or white flowers . The conclusion would depend
on this single result and would not be accurate .
Which term defines a genotype composed of two identical alleles? - Answer-
Homozygous
What statement is true about heterozygous organisms ? - Answer-Heterozygous
organisms are more genetically diverse than homozygous organisms.
,Lesson 2 - Answer-Punnett Squares
Workbook 2.1 2 questions - Answer-100%
A type of insect can be red or black . Red is the dominant trait and is represented by a
capital R . Identify the Punnett square that illustrates all offspring being homozygous
recessive for a trait . - Answer-all lowercase r
https://assets.learnosity.com/organisations/625/asset/media/1159902
Parent A is homozygous dominant for curly hair , and Parent B is homozygous
recessive for straight hair .
What is the expected phenotype of the offspring ? - Answer-curly hair
Workbook 2.2 2 questions - Answer-100%
What can be shown by a dihybrid cross experiment ? - Answer-The inheritance of one
trait does not affect the chance of inheriting another .
A dihybrid cross experiment produces offspring of four different types in the F2
generation . What is the predicted ratio of the four phenotypes in the offspring ? -
Answer-9:3:3:1
Checkpoint 2 8 questions - Answer-87.5 % 7/8
Which statement best describes a monohybrid cross ? - Answer-XXXWRONGXXX
a cross in which traits of several different characteristics are studied
(i had no time to check for the right answer sorry.)
Twenty-five percent of the possible offspring for a cross are homozygous dominant .
What genotype do each of the parents have ? - Answer-heterozygous
In pea plants , green seeds are dominant (Y) , and yellow seeds are recessive (y) . The
following Punnett square shows a cross for seed color . - Answer-100 percent
What is the ratio of tall offspring to short offspring ? - Answer-3:1
What valuable information was gained from Mendel's dihybrid crosses ?
Select all that apply . - Answer-inheritance of one trait does not affect inheritance of
another .
statistical and probability methods can be used to determine how likely an offspring is to
inherit certain traits .
Dihybrid cross experiments led Mendel to propose his law of independent assortment .
Which statement best describes this law ? - Answer-the law of independent assortment
states that alleles of different genes are inherited independently of each other .
,Read the following statement .
A dihybrid cross experiment is carried out in pea plants . The traits being observed are
flower color and stem length . In the F2 generation , 81 plants have purple flowers and
long stems , 27 plants have purple flowers and short stems , 27 plants have white
flowers and long stems , and 3 plants have white flowers and short stems .
Which traits are recessive ? - Answer-white flowers , short stem
A dihybrid cross experiment is carried out in pea plants . Which statements are true ?
Select all that apply . - Answer-the f1 generation will all have both dominant phenotypes
.
the f2 generation will be a mixture of four different phenotypes .
Lesson 3 - Answer-What Genes are Really Like
Workbook 3.1 3 questions - Answer-100%
A scientist is studying two traits on a fruit fly . She discovers that these are most often
inherited together .
What can be said about these traits ? - Answer-They are on the same chromosome and
are linked together .
why might a Punnett square predicting the results of a dihybrid cross give incorrect
results ? - Answer-The two genes are on the same chromosome, making some
combinations less likely than others .
which is an example of the environment affecting gene expression ? - Answer-some
genes being turned off in warm temperatures
Workbook 3.2 2 questions - Answer-100%
In which situation are you likely to find a trait with only one allele ? - Answer-genes
found in the DNA of the mitochondria
Multiple alleles for a gene exist in a population . Which of these statements describes
how alleles are inherited ? - Answer-An individual can only inherit two alleles for a
gene .
Checkpoint 3 9 questions - Answer-100%
Which of the following facts was unknown to Gregor Mendel ? - Answer-alleles for
genes are found on chromosomes
Why are linked traits inconsistent with Mendel's laws ? - Answer-linked traits are likely to
be inherited together. this is not consistent with mendel's law of independent
assortment.
, What is an effect that results when two genes are located side by side on the same
chromosome ? - Answer-Punnett squares can give incorrect predictions of inheritance.
What statement is true ? - Answer-a diploid organism most often has two alleles for a
trait.
What is epistasis ? - Answer-traits where one gene interferes with the effect of another
What is an example of an environmental effect on phenotype ? - Answer-the gender of
sea turtles being affected by the temperature
How many alleles are typically found for mitochondrial genes ? - Answer-1
Which of these are genes that have more than two alleles ? - Answer-the c gene for
melanin production in rabbit coats
Multiple alleles for a gene make populations more diverse .
What are the benefits of this ? Select all that apply . - Answer-it makes it more likely that
a population will survive environmental changes .
if a population encounters a new disease , some of the individuals may be immune to it .
Lesson 4 - Answer-ABO Blood Type—A Typical Gene
Workbook 4.1 - Answer-100%
Which of the following statements about polygenic inheritance are true ?
Select all that apply . - Answer-Each gene only contributes a small part to the
phenotype .
When a high number of genes is involved , the number of possible phenotypes is also
high .
What effects can epistasis have on polygenic inheritance ? Select all that apply . -
Answer-a gene can modify the effect of another gene
a gene can mask the effect of another gene
genes can combine to produce entirely new traits
Workbook 4.2 - Answer-100%
A lab technician observes that the red blood cells in a blood sample display
codominance . What alleles does the person who provided the blood sample have ? -
Answer-iA and iB
A lab technician observes that the red blood cells in a blood sample have surface
antigen B . What alleles does the person who provided the blood sample have ? -
Answer-iBiB or iBi
Exam Questions with Complete Answers
which statement is true about model organisms ? - Answer-they help scientists
understand biological processes
Read the statement :
When Mendel crossed a purple-flowered pea plant with a white-flowered pea plant , the
offspring were always X . When Mendel crossed the offspring with each other , the
distribution was about Y purple and Z white . The more experiments Mendel did with
pea plants , the closer they approached these percentages .
Which option correctly replaces X , Y , and Z in the statement ? - Answer-x : purple
y : 75%
z : 25%
A pea plant that is tall has a dominant trait . Which statements are true about the
genotype / phenotype relationship of the plant ?
Select all that apply . - Answer-- The genotype Tt always results in a phenotype that is
tall .
- When the phenotype is tall , the genotype can either be TT or Tt .
What statement would be true according to the theory of blending inheritance ? -
Answer-The offspring of a tall parent plant and a short parent plant will all have a height
in the middle .
Mendel crossed a tall pea plant with a short pea plant . All the offspring in the first
generation were tall pea plants .
How did Mendel explain why all the offspring were tall pea plants ? - Answer-Two
factors affect the height trait of pea plants . One of the factors is dominant over the other
.
In some situations , when two purple-flowered pea plants reproduce , the offspring can
have purple or white flowers . When this experiment is run repeatedly , it is discovered
that three-fourths of the offspring have purple flowers and one-fourth of the offspring
have white flowers .
What would happen if this experiment were run only once ? - Answer-The experiment
would result in a plant with either purple or white flowers . The conclusion would depend
on this single result and would not be accurate .
Which term defines a genotype composed of two identical alleles? - Answer-
Homozygous
What statement is true about heterozygous organisms ? - Answer-Heterozygous
organisms are more genetically diverse than homozygous organisms.
,Lesson 2 - Answer-Punnett Squares
Workbook 2.1 2 questions - Answer-100%
A type of insect can be red or black . Red is the dominant trait and is represented by a
capital R . Identify the Punnett square that illustrates all offspring being homozygous
recessive for a trait . - Answer-all lowercase r
https://assets.learnosity.com/organisations/625/asset/media/1159902
Parent A is homozygous dominant for curly hair , and Parent B is homozygous
recessive for straight hair .
What is the expected phenotype of the offspring ? - Answer-curly hair
Workbook 2.2 2 questions - Answer-100%
What can be shown by a dihybrid cross experiment ? - Answer-The inheritance of one
trait does not affect the chance of inheriting another .
A dihybrid cross experiment produces offspring of four different types in the F2
generation . What is the predicted ratio of the four phenotypes in the offspring ? -
Answer-9:3:3:1
Checkpoint 2 8 questions - Answer-87.5 % 7/8
Which statement best describes a monohybrid cross ? - Answer-XXXWRONGXXX
a cross in which traits of several different characteristics are studied
(i had no time to check for the right answer sorry.)
Twenty-five percent of the possible offspring for a cross are homozygous dominant .
What genotype do each of the parents have ? - Answer-heterozygous
In pea plants , green seeds are dominant (Y) , and yellow seeds are recessive (y) . The
following Punnett square shows a cross for seed color . - Answer-100 percent
What is the ratio of tall offspring to short offspring ? - Answer-3:1
What valuable information was gained from Mendel's dihybrid crosses ?
Select all that apply . - Answer-inheritance of one trait does not affect inheritance of
another .
statistical and probability methods can be used to determine how likely an offspring is to
inherit certain traits .
Dihybrid cross experiments led Mendel to propose his law of independent assortment .
Which statement best describes this law ? - Answer-the law of independent assortment
states that alleles of different genes are inherited independently of each other .
,Read the following statement .
A dihybrid cross experiment is carried out in pea plants . The traits being observed are
flower color and stem length . In the F2 generation , 81 plants have purple flowers and
long stems , 27 plants have purple flowers and short stems , 27 plants have white
flowers and long stems , and 3 plants have white flowers and short stems .
Which traits are recessive ? - Answer-white flowers , short stem
A dihybrid cross experiment is carried out in pea plants . Which statements are true ?
Select all that apply . - Answer-the f1 generation will all have both dominant phenotypes
.
the f2 generation will be a mixture of four different phenotypes .
Lesson 3 - Answer-What Genes are Really Like
Workbook 3.1 3 questions - Answer-100%
A scientist is studying two traits on a fruit fly . She discovers that these are most often
inherited together .
What can be said about these traits ? - Answer-They are on the same chromosome and
are linked together .
why might a Punnett square predicting the results of a dihybrid cross give incorrect
results ? - Answer-The two genes are on the same chromosome, making some
combinations less likely than others .
which is an example of the environment affecting gene expression ? - Answer-some
genes being turned off in warm temperatures
Workbook 3.2 2 questions - Answer-100%
In which situation are you likely to find a trait with only one allele ? - Answer-genes
found in the DNA of the mitochondria
Multiple alleles for a gene exist in a population . Which of these statements describes
how alleles are inherited ? - Answer-An individual can only inherit two alleles for a
gene .
Checkpoint 3 9 questions - Answer-100%
Which of the following facts was unknown to Gregor Mendel ? - Answer-alleles for
genes are found on chromosomes
Why are linked traits inconsistent with Mendel's laws ? - Answer-linked traits are likely to
be inherited together. this is not consistent with mendel's law of independent
assortment.
, What is an effect that results when two genes are located side by side on the same
chromosome ? - Answer-Punnett squares can give incorrect predictions of inheritance.
What statement is true ? - Answer-a diploid organism most often has two alleles for a
trait.
What is epistasis ? - Answer-traits where one gene interferes with the effect of another
What is an example of an environmental effect on phenotype ? - Answer-the gender of
sea turtles being affected by the temperature
How many alleles are typically found for mitochondrial genes ? - Answer-1
Which of these are genes that have more than two alleles ? - Answer-the c gene for
melanin production in rabbit coats
Multiple alleles for a gene make populations more diverse .
What are the benefits of this ? Select all that apply . - Answer-it makes it more likely that
a population will survive environmental changes .
if a population encounters a new disease , some of the individuals may be immune to it .
Lesson 4 - Answer-ABO Blood Type—A Typical Gene
Workbook 4.1 - Answer-100%
Which of the following statements about polygenic inheritance are true ?
Select all that apply . - Answer-Each gene only contributes a small part to the
phenotype .
When a high number of genes is involved , the number of possible phenotypes is also
high .
What effects can epistasis have on polygenic inheritance ? Select all that apply . -
Answer-a gene can modify the effect of another gene
a gene can mask the effect of another gene
genes can combine to produce entirely new traits
Workbook 4.2 - Answer-100%
A lab technician observes that the red blood cells in a blood sample display
codominance . What alleles does the person who provided the blood sample have ? -
Answer-iA and iB
A lab technician observes that the red blood cells in a blood sample have surface
antigen B . What alleles does the person who provided the blood sample have ? -
Answer-iBiB or iBi
