BY 322 Genetics Exam 1 | Questions with 100% Correct Answers
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Course
BY 322
Institution
BY 322
BY 322 Genetics Exam 1 | Questions with 100% Correct Answers A cross between two individuals with different phenotypes that resulted in approximately 50% of each type of offspring would indicate the cross was _________. A) true breeding dominant to recessive B) a heterozygous dominant crossed to ...
A cross between two individuals with different phenotypes that resulted in approximately
50% of each type of offspring would indicate the cross was _________.
A) true breeding dominant to recessive
B) a heterozygous dominant crossed to a heterozygous recessive
C) a heterozygous dominant crossed to a homozygous recessive
D) a homozygous recessive crossed with a heterozygous recessive
E) true dominant to a heterozygous dominant
If an F2 generation from a F1 self-cross always yields offspring in a 3:1 phenotypic ratio
with of the following P crosses could have occurred?
A) AA x aa
B) AA x AA
C) aa x aa
D) Aa x AA
E) aa x Aa
A recessive allele in dogs causes white spots. If two solid colored dogs are mated and
produce a spotted offspring, what is the percentage chance their next puppy would be
solid colored?
A) 25%
B) 50%
C) about 66%
D) 75%
E) about 90%
Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous
curly-haired person marries a person with straight hair, what percentage of their
offspring would be expected to have straight hair?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene.
Two parents with normal pigmentation have an albino child. What is the probability that
their next two children will be albino?
, A) 1/4
B) 1/3
C) 1/2
D) 3/4
E) 1/16
A certain type of congenital deafness in humans is caused by a rare autosomal
dominant gene. In a mating involving a deaf man and a deaf woman, could all the
children have normal hearing?
A) No, because it is dominant. Children always get the dominant alleles.
B) No, because children favor their parents
C) Yes, assuming that the parents are heterozygotes (because the gene is rare), it is
possible that all the children could have normal hearing
D) Yes, because traits assort independently
E) Yes, because it must be recessive if it's rare
Which of the following postulates was not attainable from a monohybrid cross?
A) segregation
B) independent assortment
C) Unit factors are in pairs
D) dominance/recessiveness
What is segregation?
A) during gamete formation, segregating pairs of unit factors assort independently of
each other
B) Fertilization is random
C) During gamete formation, allele pairs are separated to form haploid gametes
D) genes lie on chromosomes
E) chromosomes can swap information during meiosis
What is independent assortment?
A) during gamete formation, a pair of unit factors segregates randomly from another pair
of unit factors
B)Fertilization is random
C) During gamete formation, allele pairs are separated to form haploid gametes
D) Genes lie on chromosomes
E) Chromosomes can swap information during meiosis
Mendel utilized the garden pea for his studies based on features that include all but
________.
A) Can generate a large number of progeny
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