WorksheetsBIO 181 Chapter 14
Total questions: 8
Worksheet time: 5mins
A pea plant is heterozygous at the independent loci for flower color (Pp) and seed color (Yy). What types of gametes can it produce?
a) two gamete types: pp and PP
b) two gamete types: pY and Py
c) four gamete types: pY, py, PY, and Py
d) four gamete types: pP, Yy, pY, and Py
A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
a) the blending model of genetics.
b) true breeding.
c) dominance.
d) a dihybrid cross.
John, age 47, has just been diagnosed with Huntington’s disease, which is caused by a rare dominant allele. His daughter, age 25, has a 2-year-old son. No one else in the family has the disease. What is the probability that the daughter will develop the disease?
0%
25%
50%
75%
An individual with the genotype AaBbEeHH is crossed with an individual who is aaBbEehh. What is the likelihood of having offspring with the genotype AabbEEHh?
1/8
1/16
1/32
1/64
Roan cattle result from incomplete dominance of red and white alleles at a single locus. If two roan cattle are allowed to breed, what ratio of phenotypes is expected in the offspring? Think Heterozygous: Rr X Rr
a) 1:1 red:white
b) all roan
c) 1:2:1 red:roan:white
d) 3:1 red:white
Examine this genetic pedigree. What mode of inheritance does this trait most likely follow?
a) autosomal dominant
b) autosomal recessive
c) sex-linked recessive
d) mitochondrial
A phenotypic trait that is dependent on several genes and environmental conditions is said to be
a) epistatic.
b) pleiotropic.
c) dominant.
d) multifactorial.
Look around the classroom. Which of the following human phenotypes can likely be considered to be polygenic?
a) height
b) hair color
c) eye color
d) skin color
e) all of the above
