1) A sexually reproducing animal has two unlinked
genes, one for head shape and one for tail length. Its
genotype is HhTt. Which of the following genotypes is
possible in a gamete from this organism?
1)
2)
3)
4)
HT
Hh
HhTt
Tt
2) Which of the following is an example of polygenic
inheritance?
1)
2)
3)
4)
sex-linkage in humans
skin pigmentation in humans
pink flowers in snapdragons
white and purple color in sweet peas
3) Mendel's law of segregation was nearly impossible
for most biologists to understand until there was a
general understanding of
1) mitosis.
2) pleitropy.
3) epistasis.
4) meiosis.
4) Roan color in cattle is the result of absence of
dominance between red and white color genes. How
would one produce a herd of pure-breeding roancolored cattle?
1)
2)
3)
4)
cross roan with roan
cross roan with red
cross red with white
It cannot be done.
5) A couple who are both carriers for the gene for
cystic fibrosis have two children who have cystic
fibrosis. What is the probability that their next child
will have cystic fibrosis?
1)
2)
3)
4)
50%
75%
100%
25%
6) In crossing a homozygous recessive with a
heterozygote, what is the chance of getting an
offspring with the homozygous recessive phenotype?
1)
2)
3)
4)
75%
0%
50%
100%
1) A gene
1. is synonymous with a chromosome
2. is composed of mRNA
3. is a specific segment of nucleotides on a DNA
4. contains only those nucleotides required to synthesize
a protein