GCD 3022 Exam 1 (Practice Quizzes and Weekly Quizzes)
Questions With Complete Solutions
(Comprehension Q) A change in chromosome number is the
result of meiotic nondisjunction in which chromosomes do not
segregate properly. Nondisjunction can occur during either
meiosis I or meiosis II. When it occurs at meiosis I, Correct
Answers a pair of homologous chromosomes (or a bivalent) fail
to separate properly, producing four gametes with abnormal
numbers of chromosomes.
(Comprehension Q) A change in chromosome number is the
result of meiotic nondisjunction in which chromosomes do not
segregate properly. Nondisjunction can occur during either
meiosis I or meiosis II. When it occurs at meiosis II, Correct
Answers a pair of sister chromatids fail to separate proplery,
producing two gametes with abnormal numbers of
chromosomes.
(Comprehension Q) A cross is made between AA Bb Cc Dd and
Aa Bb cc dd. What would be the probability that the cross
produces an offspring that is AA bb Cc Dd? Correct Answers
1/32
(Comprehension Q) A man with hemophilia has children with
an unaffected woman (i.e., without disease symptom), who is
heterozygous for the X-linked mutant allele causing hemophilia.
What is the probability for his first three children to have
hemophilia? Assume his children could be male or female. Note
that hemophilia is a X-linked recessive disorder. Correct
Answers 1/8
,(Comprehension Q) A pea plant has the genotype rrYy. Assume
independent assortment. How many different types of gametes
can it make and in what proportions? Correct Answers 1 rY : 1
ry
(Comprehension Q) A person with type A blood has a child with
a person with type B blood. What are the possible blood types of
the child? Correct Answers A, B, AB, or O
(Comprehension Q) A true-breeding plant with round and green
seeds (RRyy) was crossed with a true-breeding plant with
wrinkled and yellow seeds (rrYY). Round and yellow seeds are
dominant traits. The F1 plants were crossed with plants with
wrinkled green seeds (rryy). Based on Mendel's law
(independent assortment), which of the following displays the
expected ratio of phenotypes? Correct Answers 1 Round
yellow : 1 Round green : 1 Wrinkled yellow : 1 Wrinkled green
(Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(black square & black circle newest generation but separate)
Correct Answers Autosomal recessive
(Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(three black squares) Correct Answers X-linked recessive
, (Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(white square & black circle at top) Correct Answers
Autosomal dominant
(Comprehension Q) Hemophilia is a blood-clotting disorder in
humans that follows an X-linked recessive pattern of
inheritance. A man with Hemophilia and a woman without
hemophilia have a daughter with hemophilia. If you let H
represent the common (non-disease causing) allele and h the
hemophilia allele, what are the genotypes of the parents?
Correct Answers Mother is XHXh, and father is XhY
(Comprehension Q) How many sets of chromosomes are found
in a human egg cell, and how many chromosomes are within one
set? Correct Answers 1 set, with 23 in each set
(Comprehension Q) How many sets of chromosomes are found
in a human somatic cell, and how many chromosomes are within
one set? Correct Answers 2 sets, with 23 in each set
(Comprehension Q) In humans, the allele for brown eye color
(B) is dominant to that for blue eye color (b). Two parents who
are heterozygotes for eye color produce children. What is the
probability that their first three children have brown color eye?
(Use the Product Rule) Correct Answers 27/64
(Probability to have brown eye color 3/4, three children: 3/4 x
3/4 x 3/4)
Questions With Complete Solutions
(Comprehension Q) A change in chromosome number is the
result of meiotic nondisjunction in which chromosomes do not
segregate properly. Nondisjunction can occur during either
meiosis I or meiosis II. When it occurs at meiosis I, Correct
Answers a pair of homologous chromosomes (or a bivalent) fail
to separate properly, producing four gametes with abnormal
numbers of chromosomes.
(Comprehension Q) A change in chromosome number is the
result of meiotic nondisjunction in which chromosomes do not
segregate properly. Nondisjunction can occur during either
meiosis I or meiosis II. When it occurs at meiosis II, Correct
Answers a pair of sister chromatids fail to separate proplery,
producing two gametes with abnormal numbers of
chromosomes.
(Comprehension Q) A cross is made between AA Bb Cc Dd and
Aa Bb cc dd. What would be the probability that the cross
produces an offspring that is AA bb Cc Dd? Correct Answers
1/32
(Comprehension Q) A man with hemophilia has children with
an unaffected woman (i.e., without disease symptom), who is
heterozygous for the X-linked mutant allele causing hemophilia.
What is the probability for his first three children to have
hemophilia? Assume his children could be male or female. Note
that hemophilia is a X-linked recessive disorder. Correct
Answers 1/8
,(Comprehension Q) A pea plant has the genotype rrYy. Assume
independent assortment. How many different types of gametes
can it make and in what proportions? Correct Answers 1 rY : 1
ry
(Comprehension Q) A person with type A blood has a child with
a person with type B blood. What are the possible blood types of
the child? Correct Answers A, B, AB, or O
(Comprehension Q) A true-breeding plant with round and green
seeds (RRyy) was crossed with a true-breeding plant with
wrinkled and yellow seeds (rrYY). Round and yellow seeds are
dominant traits. The F1 plants were crossed with plants with
wrinkled green seeds (rryy). Based on Mendel's law
(independent assortment), which of the following displays the
expected ratio of phenotypes? Correct Answers 1 Round
yellow : 1 Round green : 1 Wrinkled yellow : 1 Wrinkled green
(Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(black square & black circle newest generation but separate)
Correct Answers Autosomal recessive
(Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(three black squares) Correct Answers X-linked recessive
, (Comprehension Q) Assuming complete penetrance, which type
of inheritance pattern is consistent with the pedigree shown
here?
(white square & black circle at top) Correct Answers
Autosomal dominant
(Comprehension Q) Hemophilia is a blood-clotting disorder in
humans that follows an X-linked recessive pattern of
inheritance. A man with Hemophilia and a woman without
hemophilia have a daughter with hemophilia. If you let H
represent the common (non-disease causing) allele and h the
hemophilia allele, what are the genotypes of the parents?
Correct Answers Mother is XHXh, and father is XhY
(Comprehension Q) How many sets of chromosomes are found
in a human egg cell, and how many chromosomes are within one
set? Correct Answers 1 set, with 23 in each set
(Comprehension Q) How many sets of chromosomes are found
in a human somatic cell, and how many chromosomes are within
one set? Correct Answers 2 sets, with 23 in each set
(Comprehension Q) In humans, the allele for brown eye color
(B) is dominant to that for blue eye color (b). Two parents who
are heterozygotes for eye color produce children. What is the
probability that their first three children have brown color eye?
(Use the Product Rule) Correct Answers 27/64
(Probability to have brown eye color 3/4, three children: 3/4 x
3/4 x 3/4)
