BY 322 Quiz 2 | Questions with Verified 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) true dominant to a heterozygous dominant c) a h...
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) true dominant to a heterozygous dominant
c) a heterozygous dominant crossed to a homozygous recessive
d) a heterozygous dominant crossed to a heterozygous recessive
e) a homozygous recessive crossed to a heterozygous recessive
If an F2 generation from a F1 self-cross always yields offspring in a 3:1 phenotypic ratio,
which 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) 50%
b) about 90%
c) about 66%
d) 25%
e) 75%
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) 75%
b) 100%
c) 0%
d) 25%
e) 50%
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) 3/4
d) 1/16
e) 1/8
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) Yes, assuming that the parents are heterozygous (because the gene is rare), it is
possible that all of the children could have normal hearing
b) Yes, because it must be recessive if it is rare
c) No, because children favor their parents
d) Yes, because traits assort independently
e) No, because it is dominant. Children always get the dominant alleles.
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) genes lie on chromosomes
b) during gamete formation, allele pairs are separated to form haploid gametes
c) chromosomes can swap information during meiosis
d) during gamete formation, segregating pairs of unit factors assort independently of
each other
e) fertilization is random
What is independent assortment?
a) Chromosomes can swap information during meiosis
b) during gamete formation, allele pairs are separated to form haploid gametes
c) genes lie on chromosomes
d) during gamete formation, a pair of unit factors segregates randomly from another pair
of unit factors
e) fertilization is random
Mendel utilized the garden pea, Pisum sativum for his studies based on features that
include all but______.
a) can generate a large number of progeny
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