Genetics Exams questions and
answers graded A+
If a plant with purple, axial flowers and green, inflated pods is heterozygous for all four genes, how
many different types of gametes can it produce?
1
4
8
9
16 - ANS✅✅16
In his monohybrid crosses for seed color in peas, Mendel reported 6,022 yellow seeds and 2,001
green seeds. How many of each color class were expected?
4,011 green and 4,011 yellow
All should be green
All should be yellow
6,017 yellow and 2,006 green
2,006 yellow and 6,017 green - ANS✅✅6,017 yellow and 2,006 green
In the accompanying figure, the chance that individual III-2 is a heterozygous carrier is __________.
0%
25%
50%
75%
100% - ANS✅✅100%
Crossing over or recombination most frequently occurs during
,prophase I of meiosis
metaphase II of meiosis
prophase of mitosis
telophase of mitosis
prophase II of meiosis - ANS✅✅prophase I of meiosis
Crossing over is
> the place on a homologous pair of chromosomes at which a physical exchange occurs.
> an extremely rare event.
> an event that only takes place during meiosis.
> the reciprocal exchange of homologous regions of chromatids.
> not useful in mapping genes. - ANS✅✅the reciprocal exchange of homologous regions of
chromatids.
Why are chromosomes more easily visible under a microscope during Metaphase as compared to G2
phase?
> They become stained by natural pigments in the cell.
> There is twice as much DNA during Metaphase than during G2 phase.
> Chromosomes are contained in the nucleus during G2 but not during metaphase.
> Proteins that bind chromosomes during Metaphase are highly visible.
> They are highly condensed in Metaphase. - ANS✅✅They are highly condensed in Metaphase.
The statistical interpretation of a chi-square value is determined by identifying the __________.
mean.
degrees of freedom.
average.
P value.
joint probability. - ANS✅✅P value
,Full pod shape ( F) is dominant to constricted pod shape ( f ), and yellow pod color ( Y) is dominant to
green pod color ( y) in pea plants. A pure-breeding green plant with full pods is crossed with a pure-
breeding yellow plant with constricted pods. The offspring are then testcrossed. What is the
expected phenotypic ratio of the offspring?
1:2:1
3:1
1:1:1:1
9:3:3:1
9:7 - ANS✅✅1:1:1:1
In Guinea pigs, short hair (S) is dominant over long hair (s), rough coat (R) is dominant over smooth
coat (r), and black hair (B) is dominant over white hair (b). Which of the following individuals could
produce these (and only these) four possible gametes: SRb, Srb, sRb, srb
SSRRbb
ssRrBB
SsRrbb
SsRrBb
SSRrBb - ANS✅✅SsRrbb
The cross AaBb x aabb is called a
dihybrid cross
backcross
reciprocal cross
testcross
monohybrid cross - ANS✅✅testcross
At the conclusion of mitosis, there are ______ haploid cell products produced.
0
1
, 2
3
4 - ANS✅✅0
Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose
father was colorblind has children with a man with normal color vision. What is the probability that
their first child will be colorblind?
1/4
1/2
3/4
0
1 - ANS✅✅1/4
During cell division, cytokinesis is completed by the end of
prophase
anaphase
metaphase
telophase
interphase - ANS✅✅telophase
Barring new mutation, and assuming complete penetrance and single-locus inheritance, what are
possible modes of inheritance of the trait shown in figure below?
Male + Female not colored
1 male child not colored married a female that isn't colored who have three children, 2 girls and 1
boy in which 1 of the girls has the trait (it is colored in on the genogram)
autosomal recessive.
autosomal dominant.
X-linked recessive.
answers graded A+
If a plant with purple, axial flowers and green, inflated pods is heterozygous for all four genes, how
many different types of gametes can it produce?
1
4
8
9
16 - ANS✅✅16
In his monohybrid crosses for seed color in peas, Mendel reported 6,022 yellow seeds and 2,001
green seeds. How many of each color class were expected?
4,011 green and 4,011 yellow
All should be green
All should be yellow
6,017 yellow and 2,006 green
2,006 yellow and 6,017 green - ANS✅✅6,017 yellow and 2,006 green
In the accompanying figure, the chance that individual III-2 is a heterozygous carrier is __________.
0%
25%
50%
75%
100% - ANS✅✅100%
Crossing over or recombination most frequently occurs during
,prophase I of meiosis
metaphase II of meiosis
prophase of mitosis
telophase of mitosis
prophase II of meiosis - ANS✅✅prophase I of meiosis
Crossing over is
> the place on a homologous pair of chromosomes at which a physical exchange occurs.
> an extremely rare event.
> an event that only takes place during meiosis.
> the reciprocal exchange of homologous regions of chromatids.
> not useful in mapping genes. - ANS✅✅the reciprocal exchange of homologous regions of
chromatids.
Why are chromosomes more easily visible under a microscope during Metaphase as compared to G2
phase?
> They become stained by natural pigments in the cell.
> There is twice as much DNA during Metaphase than during G2 phase.
> Chromosomes are contained in the nucleus during G2 but not during metaphase.
> Proteins that bind chromosomes during Metaphase are highly visible.
> They are highly condensed in Metaphase. - ANS✅✅They are highly condensed in Metaphase.
The statistical interpretation of a chi-square value is determined by identifying the __________.
mean.
degrees of freedom.
average.
P value.
joint probability. - ANS✅✅P value
,Full pod shape ( F) is dominant to constricted pod shape ( f ), and yellow pod color ( Y) is dominant to
green pod color ( y) in pea plants. A pure-breeding green plant with full pods is crossed with a pure-
breeding yellow plant with constricted pods. The offspring are then testcrossed. What is the
expected phenotypic ratio of the offspring?
1:2:1
3:1
1:1:1:1
9:3:3:1
9:7 - ANS✅✅1:1:1:1
In Guinea pigs, short hair (S) is dominant over long hair (s), rough coat (R) is dominant over smooth
coat (r), and black hair (B) is dominant over white hair (b). Which of the following individuals could
produce these (and only these) four possible gametes: SRb, Srb, sRb, srb
SSRRbb
ssRrBB
SsRrbb
SsRrBb
SSRrBb - ANS✅✅SsRrbb
The cross AaBb x aabb is called a
dihybrid cross
backcross
reciprocal cross
testcross
monohybrid cross - ANS✅✅testcross
At the conclusion of mitosis, there are ______ haploid cell products produced.
0
1
, 2
3
4 - ANS✅✅0
Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose
father was colorblind has children with a man with normal color vision. What is the probability that
their first child will be colorblind?
1/4
1/2
3/4
0
1 - ANS✅✅1/4
During cell division, cytokinesis is completed by the end of
prophase
anaphase
metaphase
telophase
interphase - ANS✅✅telophase
Barring new mutation, and assuming complete penetrance and single-locus inheritance, what are
possible modes of inheritance of the trait shown in figure below?
Male + Female not colored
1 male child not colored married a female that isn't colored who have three children, 2 girls and 1
boy in which 1 of the girls has the trait (it is colored in on the genogram)
autosomal recessive.
autosomal dominant.
X-linked recessive.
