BIOD 210 Exam 2 | Questions and Answers Latest
Updated (Graded A+)- Portage Learning
1. Which of the following statements is correct?
Dominance and recessiveness are not linked to the sex chromosomes.
Mendels label of unit factors are what we now refer to as genes.
2. True or False: A dominant gene will always cause the expression of a
dominant phenotype in any genetic cross.
False
3. People with sickle-cell disease can become very sick under what
conditions?
High altitudes
4. A homozygous long-haired cat is bred to a homozygous short-haired
cat. Assuming that the gene for long hair is completely dominant,
what are the chances of the F1 offspring being long-haired?
100%
5. A dog breeder is looking to cross a long-haired female dog with a
short-haired male dog. The gene for hair length has incomplete
dominance. By crossing the F1 offspring, what percentage of the F2
generation are predicted to be short-haired?
A 1:2:1 ratio predicts 25% of the offspring to be homozygous short-
haired.
6. Consider 3 genes that assort independently in squirrels. A gene for
brown color is dominant (D), a gene for a bushy tail is dominant (B),
and a gene for reflux after eating acorns is recessive (a). Use the
product law to predict the likelihood of producing a squirrel (from
parents that are heterozygous for each trait individually) that is
brown, bushy-tailed, and has reflux from all those acorns.
(3/4) x (3/4) x (1/4) = 9/64 probability of this squirrel being brown,
bushy-tailed, and having reflux.
7. Two individuals with widow's peaks have a child with a straight
hairline.
A. Is the gene for a widow's peak likely dominant or recessive?
B. Could you predict the genotype of the parents, assuming there is no
codominance?
C. If the child with the straight hairline someday marries a person
with a widow's peak, can you predict for certain whether their
offspring will have a widow's peak?
, A. Dominant (WW or Ww) would produce a widow's peak. Because
both parents have widow's peaks, only a homozygous recessive (ww)
would result in the opposing phenotype of a straight hairline.
B. The parents are likely heterozygous for a widow's peak (Ww) to
pass along a ww genotype.
C. You cannot predict for certain, because the other parent could be
heterozygous (Ww) or homozygous (WW) for a widow's peak, and
either phenotype (Ww or ww) could be produced.
8. Alternate forms of a gene are termed:
Alleles
9. A karyotype is a snapshot of the within the cell. cells are
isolated and stained so that a trained geneticist can organize them
into chromosomes to detect genetic abnormalities.
Chromosomes; white blood; homologous or paired
10. True or False: A normal chromosome set always has paired X
and Y chromosomes.
False
11. The phenotype for sickle-cell anemia is distortion of the in
afflicted people. This results in depletion of in the blood and
poses a significant risk to the patients at high . Sickle-cell anemia
is caused by mutation(s) in the protein sequence.
Red blood cells; oxygen; altitude; one
12. The phenotype for is distortion of the red blood cells in
afflicted people. This results in depletion of in the blood and
poses a significant risk to the patients at altitude. Sickle-cell
anemia is caused by one in the protein sequence.
Sickle-cell anemia; oxygen; high; mutation
13. Why did Mendel choose the pea plant as his genetics model?
a) It was self-fertilizer
b) It was easy to cross-breed
14. In a cross, the original generation is known as the
generation and the first generation of their offspring is known as the
generation.
P1 or parental; f1
15. Which of Mendel's hypotheses needs a correction? Make the
correction.
- Genetic characters are controlled by unit factors existing in pairs in
individual organisms.
Updated (Graded A+)- Portage Learning
1. Which of the following statements is correct?
Dominance and recessiveness are not linked to the sex chromosomes.
Mendels label of unit factors are what we now refer to as genes.
2. True or False: A dominant gene will always cause the expression of a
dominant phenotype in any genetic cross.
False
3. People with sickle-cell disease can become very sick under what
conditions?
High altitudes
4. A homozygous long-haired cat is bred to a homozygous short-haired
cat. Assuming that the gene for long hair is completely dominant,
what are the chances of the F1 offspring being long-haired?
100%
5. A dog breeder is looking to cross a long-haired female dog with a
short-haired male dog. The gene for hair length has incomplete
dominance. By crossing the F1 offspring, what percentage of the F2
generation are predicted to be short-haired?
A 1:2:1 ratio predicts 25% of the offspring to be homozygous short-
haired.
6. Consider 3 genes that assort independently in squirrels. A gene for
brown color is dominant (D), a gene for a bushy tail is dominant (B),
and a gene for reflux after eating acorns is recessive (a). Use the
product law to predict the likelihood of producing a squirrel (from
parents that are heterozygous for each trait individually) that is
brown, bushy-tailed, and has reflux from all those acorns.
(3/4) x (3/4) x (1/4) = 9/64 probability of this squirrel being brown,
bushy-tailed, and having reflux.
7. Two individuals with widow's peaks have a child with a straight
hairline.
A. Is the gene for a widow's peak likely dominant or recessive?
B. Could you predict the genotype of the parents, assuming there is no
codominance?
C. If the child with the straight hairline someday marries a person
with a widow's peak, can you predict for certain whether their
offspring will have a widow's peak?
, A. Dominant (WW or Ww) would produce a widow's peak. Because
both parents have widow's peaks, only a homozygous recessive (ww)
would result in the opposing phenotype of a straight hairline.
B. The parents are likely heterozygous for a widow's peak (Ww) to
pass along a ww genotype.
C. You cannot predict for certain, because the other parent could be
heterozygous (Ww) or homozygous (WW) for a widow's peak, and
either phenotype (Ww or ww) could be produced.
8. Alternate forms of a gene are termed:
Alleles
9. A karyotype is a snapshot of the within the cell. cells are
isolated and stained so that a trained geneticist can organize them
into chromosomes to detect genetic abnormalities.
Chromosomes; white blood; homologous or paired
10. True or False: A normal chromosome set always has paired X
and Y chromosomes.
False
11. The phenotype for sickle-cell anemia is distortion of the in
afflicted people. This results in depletion of in the blood and
poses a significant risk to the patients at high . Sickle-cell anemia
is caused by mutation(s) in the protein sequence.
Red blood cells; oxygen; altitude; one
12. The phenotype for is distortion of the red blood cells in
afflicted people. This results in depletion of in the blood and
poses a significant risk to the patients at altitude. Sickle-cell
anemia is caused by one in the protein sequence.
Sickle-cell anemia; oxygen; high; mutation
13. Why did Mendel choose the pea plant as his genetics model?
a) It was self-fertilizer
b) It was easy to cross-breed
14. In a cross, the original generation is known as the
generation and the first generation of their offspring is known as the
generation.
P1 or parental; f1
15. Which of Mendel's hypotheses needs a correction? Make the
correction.
- Genetic characters are controlled by unit factors existing in pairs in
individual organisms.
