Genetics Practice 3/2 (50 pts)
***For EACH problem, draw a Punnett Square and give the phenotypes of the
offspring***
1. Tall is dominant to short in plants.
a. Cross a homozygous tall plant with a heterozygous tall plant.
b. Cross a short plant with a pure breeding tall plant.
c. Cross a short plant with a heterozygous tall plant.
2. Long hair is recessive to short hair in guinea pigs.
a. Cross a homozygous short with a long haired guinea pig.
b. Cross a heterozygous short with a homozygous short haired guinea pig.
c. Cross a heterozygous short with a long haired guinea pig.
3. Hemophilia is a sex-linked disorder.
a. Cross a carrier female with a normal male.
b. Cross a hemophiliac male with a normal female.
c. Cross a hemophiliac male with a carrier female.
4. Colorblindness is a sex-linked disorder.
a. Cross a carrier female with a normal male.
b. Cross a colorblind male with a normal female.
c. Cross a colorblind male with a carrier female.
5. In snapdragons, color is determined by incomplete dominance. RR is red, Rr is
pink and rr is white.
a. Cross a white and a pink flower.
b. Cross a pink and a red flower.
c. Cross a red and a white flower.
d. Cross two pink flowers.
6. In horses, coloration is determined by co-dominance. RR is red, R1R is roan and
R1R1 is white.
a. Cross a white and a red horse.
b. Cross a roan and a red horse.
c. Cross a roan and a white horse.
d. Cross two roan horses.
(10 pts.) Draw a pedigree of your family and include 3 generations. Remember aunts,
uncles, cousins, etc…