An organism that has two different alleles of a gene for a character (for example, Yy) is
to be ______________ for that character
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heterozygous
__________ is the second phase of mitosis, in which chromosomes line up along the
equator of the cells. This phase is followed by anaphase, when sister chromatids
separate.
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Metaphase
,Two healthy parents give birth to a child with cystic fibrosis, an autosomal recessive
disorder. What can we say about both parents in terms of the genotype and/or
phenotype?
a. One parent must be homozygous for the disease
b. Both parents are homozygous for the disease allele
c. One parent must be heterozygous for the disease allele. The other must be
homozygous healthy
d. Both parents are heterozygous for the disease allele
e. Only one parent must be heterozygous for the disease allele
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d. both parents are heterozygous for the disease allele
A locus is ____________________
a. the specific physical locations of genes on a chromosome
b. the variations of the same gene
c. a homozygote
d. a heterozygote
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a. the specific physical locations of genes on a chromosome
What is a test cross?
a. crossing two organisms heterozygous for a trait
b. crossing two pure-breeding organisms of opposite phenotypes
c. crossing two organisms with the dominant phenotype
,d. crossing an organism with a dominant phenotype (and unknown genotype) with
one that has a recessive phenotype
e. crossing a heterozygous organism with one that has a recessive phenotype
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d. crossing an organism with a dominant phenotype (and unknown
genotype) with one that has a recessive phenotype
e. crossing a heterozygous
Which of the following describes asexual reproduction?
a. Asexual reproduction allows for new combination of genes
b. Asexual reproduction contributes to the growth of multi-cellular organisms,
whereas sexual reproduction can
c. Asexual reproduction requires specialized cells
d. Asexual reproduction reproduces greater genetic variation than does sexual
reproduction
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b. Asexual reproduction contributes to the growth of multi-cellular
organisms, whereas sexual reproduction can
Let's consider meiosis in mosquitoes, which have three pairs of homologous
chromosomes (n = 3, 2n = 6). At the conclusion of meiotic cell division, a mosquito can
produce how many different gametes with unique sets of chromosomes (excluding
crossing over).
a. 16
b. 8
c. 4
, d. 2
e. 1
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b. 8
phenotype
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-the physical characteristics of an organism
-can be defined as outward appearance (such as flower color), as behavior,
or in molecular terms (such as glycoproteins on red blood cells)
In the 1800s, it was commonly believed that the traits of both parents for any feature
blended to create the offspring and that the blended trait was passed on. Which of
the following observations was most important to Mendel's understanding of genes
as unchanged units of information?
a. Dominant traits are always expressed in children
b. Recessive traits can disappear and then reappear in later generations
c. Dominant traits are more common in the population
d. Pure breeding lines always produce the same offspring
e. Recessive traits are not expressed in children
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b. Recessive traits can disappear and then reappear in later generations
to be ______________ for that character
Give this one a try later!
heterozygous
__________ is the second phase of mitosis, in which chromosomes line up along the
equator of the cells. This phase is followed by anaphase, when sister chromatids
separate.
Give this one a try later!
Metaphase
,Two healthy parents give birth to a child with cystic fibrosis, an autosomal recessive
disorder. What can we say about both parents in terms of the genotype and/or
phenotype?
a. One parent must be homozygous for the disease
b. Both parents are homozygous for the disease allele
c. One parent must be heterozygous for the disease allele. The other must be
homozygous healthy
d. Both parents are heterozygous for the disease allele
e. Only one parent must be heterozygous for the disease allele
Give this one a try later!
d. both parents are heterozygous for the disease allele
A locus is ____________________
a. the specific physical locations of genes on a chromosome
b. the variations of the same gene
c. a homozygote
d. a heterozygote
Give this one a try later!
a. the specific physical locations of genes on a chromosome
What is a test cross?
a. crossing two organisms heterozygous for a trait
b. crossing two pure-breeding organisms of opposite phenotypes
c. crossing two organisms with the dominant phenotype
,d. crossing an organism with a dominant phenotype (and unknown genotype) with
one that has a recessive phenotype
e. crossing a heterozygous organism with one that has a recessive phenotype
Give this one a try later!
d. crossing an organism with a dominant phenotype (and unknown
genotype) with one that has a recessive phenotype
e. crossing a heterozygous
Which of the following describes asexual reproduction?
a. Asexual reproduction allows for new combination of genes
b. Asexual reproduction contributes to the growth of multi-cellular organisms,
whereas sexual reproduction can
c. Asexual reproduction requires specialized cells
d. Asexual reproduction reproduces greater genetic variation than does sexual
reproduction
Give this one a try later!
b. Asexual reproduction contributes to the growth of multi-cellular
organisms, whereas sexual reproduction can
Let's consider meiosis in mosquitoes, which have three pairs of homologous
chromosomes (n = 3, 2n = 6). At the conclusion of meiotic cell division, a mosquito can
produce how many different gametes with unique sets of chromosomes (excluding
crossing over).
a. 16
b. 8
c. 4
, d. 2
e. 1
Give this one a try later!
b. 8
phenotype
Give this one a try later!
-the physical characteristics of an organism
-can be defined as outward appearance (such as flower color), as behavior,
or in molecular terms (such as glycoproteins on red blood cells)
In the 1800s, it was commonly believed that the traits of both parents for any feature
blended to create the offspring and that the blended trait was passed on. Which of
the following observations was most important to Mendel's understanding of genes
as unchanged units of information?
a. Dominant traits are always expressed in children
b. Recessive traits can disappear and then reappear in later generations
c. Dominant traits are more common in the population
d. Pure breeding lines always produce the same offspring
e. Recessive traits are not expressed in children
Give this one a try later!
b. Recessive traits can disappear and then reappear in later generations
