NAME: ______________________________________________________________ DATE: _____________________ BLOCK: _________
MONOHYBRID PRACTICE
In bears black fur (B) is dominant to brown fur(b). Identify the genotype for each description below.
1. Homozygous brown bear
______________
3. Heterozygous black bear
______________
2. Brown bear
______________
4. Homozygous dominant
______________
In guinea pigs long fur (F) is dominant to short fur (f). Write the genotype for each description below
5. Homozygous recessive
______________
7. True-breeding long fur
______________
6. Short fur
______________
8. Heterozygous
______________
9. Circle all that are homozygous
RR
Qq
tt
10. Circle all that are recessive
RR
Qq
tt
11. Circle all that are dominant
RR
Qq
tt
12. Circle all that are heterozygous
RR
Qq
tt
Tt
Ll
bb
gg
Tt
Ll
bb
gg
Tt
Ll
bb
gg
Tt
Ll
bb
gg
In dogs, wire hair (S) is dominant to smooth hair (s). In a cross of a homozygous wire-haired dog with a
smooth-haired dog, what will be the expected phenotype of their offspring?
13. What is the genotype of the homozygous wire-haired dog? ___________________
14. What is the genotype of smooth-haired dog? ___________
15. Complete a Punnett square
16. What is the expected percent of wire-haired dogs? __________
17. What is the expected percent of short haired dogs? __________
18. In pea plants, tall plants are dominant to short plants. A short plant and a heterozygous tall plant
were cross pollinated. Predict the genotype and phenotype of the offspring.
19. In a certain plant yellow fruit is dominant to white fruit. A heterozygous plant with yellow fruit is
crossed with a plant with white fruit. Determine the probable offspring.
20. In corn, normal kernels are dominant to waxy kernels. If you crossed a waxy kernel plant to a
heterozygous normal plant what type of seeds would be produced?
21. In garden peas, round peas are dominant to wrinkled peas. If you crossed a homozygous dominant
and homozygous recessive what would be the genotype and phenotype of the offspring?
In rabbits, gray hair is dominant to white hair. Also in rabbits, black eyes are dominant to red eyes.
These letters represent the genotypes of the rabbits:
22. A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb the
square is set up below. Fill it out and determine the phenotypes and proportions in the offspring.
23.
How many out of 16 have gray fur and black eyes? ________
24.
How many out of 16 have gray fur and red eyes? ________
25.
How many out of 16 have white fur and black eyes? ________
26. How many out of 16 have white fur and red eyes________