Genetics BIO-351 Test #1 2025
Questions and Answers 100% Pass
A ___________ is a sequence of nucleotides that are basic units of biological
information. - ✔✔Gene
___________ is the science of heredity and it seeks a precise explanation of the biological
structures and mechanisms that determine what is inherited and how it is inherited. -
✔✔Genetics
___________ is the purposeful control over mating by choice of parents for the next
generation. - ✔✔Artificial Selection
___________ is the process whereby both egg and pollen come from the same plant. -
✔✔Self Fertilization
___________ is a Mendelian Law that states that both alleles must separate during
gamete formation. - ✔✔Law of Segregation.
___________, ___________ and ___________ all were involved in the rediscovery of
Mendel's research. - ✔✔Corens, deVaries, Tschermak
Normal Male - ✔✔XY
Normal Female - ✔✔XX
Marriage - ✔✔
Affected Male - ✔✔
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 1
,___________ Inherited trait expressed only when the controlling gene is homozygous. -
✔✔Recessive
___________ One contrasting form of a gene. - ✔✔Allele
___________ Symbol for the grandparent of a given individual. - ✔✔P2
___________ The observable properties of an organism that are under genetic control. -
✔✔Phenotype
The first offspring from the parents are called. - ✔✔F1
A ___________ is a cross between an unknown and homozygous recessive. -
✔✔Testcross
If an individual has 10 gene pairs, how many different gametes can be formed if three of
the gene pairs are homozygous and the remaining 7 gene pairs are heterozygous? -
✔✔128
If the parents of a family already have two boys, what is the probability that the next
two offsprings will be girls? - ✔✔1/4
If some genetically engineered corn plants the dominant gene (BT) produces a protein
that is lethal to certain flying inset pests that cell the corn plants. It was also found that
the pollen could also cause death in some flying insects. If the corn plant is
heterozygous for BT, what proportion of the pollen would carry the dominant gene? -
✔✔1/2
Suppose that in plants, smooth seeds (S) are dominant to wrinkle seeds (s) and tall
plants (T) are dominant to short plants (t). A tall plant with smooth seeds was
backcrossed to a parent that was short and wrinkle. What proportion of the progeny is
expected to e heterozygous for tall and smooth? - ✔✔1/4
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 2
, Suppose that in plants, smooth seeds (S) are dominant to wrinkle seeds (s) and tall
plants (T) are dominant to short plants (t). A tall plant with smooth seeds was
backcrossed to a parent that was short and wrinkle. What proportion of the progeny is
expected to be homozygous for short and wrinkle? - ✔✔1/4
Sickle cell anemia is a recessive trait in humans. In a cross between a father who has
sickle cell anemia and a mother is heterozygous for the gene, what is the probability
that their first three children will be normal? - ✔✔1/2
The dominant trait, Huntington disease causes severe neural/brain damage at
approximately age 4. A female who mother has Huntington disease, marries a male
whose parents are normal. It is not known if the female has the disease. What is the
probability that their first-born will inherit the gene that causes Huntington disease? -
✔✔25%
In a monohybrid cross AA x aa, how many homozygotes are found among the F2
offspring? - ✔✔3
In a monohybrid cross AA x aa, how many heterozygotes are fun among the F2
offspring? - ✔✔2
In a dihybrid cross AAbb x aaBB, how many homozygotes are found among the F2
offspring? - ✔✔4
In a dihybrid cross AABB x aabb, how many heterozygotes at both gene pairs are found
among the F2 offspring? - ✔✔4
In the dihybrid cross AaBb x aabb, how many homozygotes are hound among the F1
offspring? - ✔✔1
In the dihybrid cross AaBb x aabb, how many heterozygotes for both gene pairs are
found among the F1 offspring? - ✔✔1
Among the dihybrid crosses below, which will give a 1:1 ratio? - ✔✔AaBB x aaBB
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 3
Questions and Answers 100% Pass
A ___________ is a sequence of nucleotides that are basic units of biological
information. - ✔✔Gene
___________ is the science of heredity and it seeks a precise explanation of the biological
structures and mechanisms that determine what is inherited and how it is inherited. -
✔✔Genetics
___________ is the purposeful control over mating by choice of parents for the next
generation. - ✔✔Artificial Selection
___________ is the process whereby both egg and pollen come from the same plant. -
✔✔Self Fertilization
___________ is a Mendelian Law that states that both alleles must separate during
gamete formation. - ✔✔Law of Segregation.
___________, ___________ and ___________ all were involved in the rediscovery of
Mendel's research. - ✔✔Corens, deVaries, Tschermak
Normal Male - ✔✔XY
Normal Female - ✔✔XX
Marriage - ✔✔
Affected Male - ✔✔
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 1
,___________ Inherited trait expressed only when the controlling gene is homozygous. -
✔✔Recessive
___________ One contrasting form of a gene. - ✔✔Allele
___________ Symbol for the grandparent of a given individual. - ✔✔P2
___________ The observable properties of an organism that are under genetic control. -
✔✔Phenotype
The first offspring from the parents are called. - ✔✔F1
A ___________ is a cross between an unknown and homozygous recessive. -
✔✔Testcross
If an individual has 10 gene pairs, how many different gametes can be formed if three of
the gene pairs are homozygous and the remaining 7 gene pairs are heterozygous? -
✔✔128
If the parents of a family already have two boys, what is the probability that the next
two offsprings will be girls? - ✔✔1/4
If some genetically engineered corn plants the dominant gene (BT) produces a protein
that is lethal to certain flying inset pests that cell the corn plants. It was also found that
the pollen could also cause death in some flying insects. If the corn plant is
heterozygous for BT, what proportion of the pollen would carry the dominant gene? -
✔✔1/2
Suppose that in plants, smooth seeds (S) are dominant to wrinkle seeds (s) and tall
plants (T) are dominant to short plants (t). A tall plant with smooth seeds was
backcrossed to a parent that was short and wrinkle. What proportion of the progeny is
expected to e heterozygous for tall and smooth? - ✔✔1/4
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 2
, Suppose that in plants, smooth seeds (S) are dominant to wrinkle seeds (s) and tall
plants (T) are dominant to short plants (t). A tall plant with smooth seeds was
backcrossed to a parent that was short and wrinkle. What proportion of the progeny is
expected to be homozygous for short and wrinkle? - ✔✔1/4
Sickle cell anemia is a recessive trait in humans. In a cross between a father who has
sickle cell anemia and a mother is heterozygous for the gene, what is the probability
that their first three children will be normal? - ✔✔1/2
The dominant trait, Huntington disease causes severe neural/brain damage at
approximately age 4. A female who mother has Huntington disease, marries a male
whose parents are normal. It is not known if the female has the disease. What is the
probability that their first-born will inherit the gene that causes Huntington disease? -
✔✔25%
In a monohybrid cross AA x aa, how many homozygotes are found among the F2
offspring? - ✔✔3
In a monohybrid cross AA x aa, how many heterozygotes are fun among the F2
offspring? - ✔✔2
In a dihybrid cross AAbb x aaBB, how many homozygotes are found among the F2
offspring? - ✔✔4
In a dihybrid cross AABB x aabb, how many heterozygotes at both gene pairs are found
among the F2 offspring? - ✔✔4
In the dihybrid cross AaBb x aabb, how many homozygotes are hound among the F1
offspring? - ✔✔1
In the dihybrid cross AaBb x aabb, how many heterozygotes for both gene pairs are
found among the F1 offspring? - ✔✔1
Among the dihybrid crosses below, which will give a 1:1 ratio? - ✔✔AaBB x aaBB
COPYRIGHT © 2025 BY SOPHIA BENNETT, ALL RIGHTS RESERVED 3
