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Bioology questions to answer
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Select one answer.
10 points
Genes on the X chromosome are called
A. O epistatic
B. sex-linked
c. O somatic
D. O autosomal
Question 2
Hemophilia is a recessive disorder and is on the X chromosome. Hemophilia is
Select one answer
10 points
A. O found more often in males than females
B. O found more often in females than males
c. O equally common in males and females
Question 3
Select one answer.
10 points
A gene that encodes an enzyme required for ribose synthesis is found on the X
chromosome. Females that are heterozygous for the wild-type and defective
mutant allele of this gene will show:
A. О 100% of the enzyme activity in their cells, since the X-chromosome
with the inactive gene will be condensed.
B. O None of their cells will have the enzyme activity since the
chromosome with the inactive allele will cause the other X-
chromosome to become condensed.
c. O 50% of the enzyme activity in their cells, since one allele is inactive.
D. O 50% of their cells will lack enzymatic activity, the other 50% will be
active.
Sickle cell anemia is an autosomal recessive disorder. If two heterozygous
individuals breed, what is the chance that their offspring will develop Sickle cell
anemia?
Select one answer.
10 points
A. 100%
B. O 75%
C. O 50%
D. O 25%
Question 5
According to the pedigree below, this trait is
Select one answer
10 points
A. O Sex-linked dominant
B.
autosomal dominant
c. O autosomal recessive
D. O Sex-linked recessive
Sickle cell anemia is an autosomal recessive disorder. A person with the disorder Select one answer.
and a person that is a carrier mate. (A carrier has the allele for the trait but
does not express it.)
10 points
What is the chance that their offspring will develop sickle cell anemia?
A. О 100%
B. O 75%
C. 50%
D. O 25%
Question 7
Select one answer
Nondisjunction in meiosis I results in
10 points
A. O one cell missing a chromosome, one cell with missing a
chromosome and two healthy cells.
B. O two cells missing a chromosome and two healthy cells.
c. O two cells with an additional chromosome and two healthy cells
D. O two cells missing a chromosome and two cells with an additional
chromosome
Question 8
What is the genotype of the shaded individuals in the following pedigree?
Select one answer.
10 points
Question 8
S
What is the genotype of the shaded individuals in the following pedigree?
A.
AA
B.
aa
С. ОАа
D. O Either AA or Aa
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