1. 2. Find genotype ratio (%) 3. Find phenotype ratio (%)
Directions
For each problem,
Create Punnett square
2. Find genotype ratio (%)
3. Find phenotype ratio (%)

2. Practice Punnett 1
What would the result be from a cross between a homozygous dominant white polar bear with a homozygous recessive yellow polar bear?

3. Practice Punnett 2
What would the result be from a cross between a homozygous dominant white polar bear with a heterozygous dominant white polar bear?

4. Practice Punnett 3
What would the result be from a cross between a heterozygous dominant white polar bear with a homozygous recessive yellow polar bear?

5. Practice Punnett 4
What would the result be from a cross between two heterozygous dominant white polar bears?

6. Practice Punnett 5
If you cross two white polar bears and ¾ of the children are white and ¼ of the children are yellow… What MUST the genotype of the parents be?

7. Practice Punnett 6
In corn plants, green (G) is dominant to albino (g). What is the chance of two heterozygous flowers producing albino corn plants?

8. Practice Punnett 7
In pea plants, tall plants are dominant to short plants. If two heterozygous tall plants are crossed, what percent of the offspring will be short?

9. Practice Punnett 8
In pea plants, tall plants are dominant to short plants. If a heterozygous tall plant and homozygous short plant are crossed, what percent of the offspring will be short?

10. Practice Punnett 9
In rabbits, short fur (F) is dominant to long fur (f). What is the chance of two homozygous long-haired rabbits having offspring with short fur?

11. Practice Punnett 10
Mendel crossed a red flower and a white flower and all the offspring were red. What MUST the genotypes of the parents have been?

12. Practice Punnett 11
In radishes, the gene that controls color exhibits incomplete dominance. Pure-breeding red radishes crossed with pure-breeding white radishes make purple radishes. What are the genotypic and phenotypic ratios when you cross a purple radish with a white radish?

13. Practice Punnett 12
Crossing a black cat with a tan cat produces a tabby cat (combination of black and tan spots). Cross a black cat with a tabby cat, what are the phenotypes of the offspring? If you wanted all tabby cats, what color cats would you want to breed?

14. Practice Punnett 13
If a man with type AB blood marries a woman heterozygous for Type A blood, what is the probability that their child will be type B?

15. Practice Punnett 14
A mother has type A blood and a father has type B blood. If their baby has type O blood, what is the genotype of each parent?

16. Practice Punnett 15
What are the possible genotypes and phenotypes for a cross between an individual that has type O blood and another individual who has type AB blood.

17. Practice Punnett 16
Two women gave birth to girls in the same hospital at the same time. The nurses think they may have accidentally switched the babies’ name tags and given the babies to the wrong parents. One baby, Jane, is type O blood. The other baby, Mary, is type A blood. The father of one set of parents, the Reds, is type A blood and the mother is type B. The father in the other set of parents , the Greens, is blood type AB, and the mother is type O. Figure out which baby belongs to which set of parents. Show your work/reasoning

18. Practice Punnett 17
In fruit flies, one eye color gene is X-linked, with a recessive white allele and a dominant red allele. If white-eyed female flies were bred to red-eyed male flies, what would be the expected offspring?

19. Practice Punnett 18
Earl has normal color vision, while his wife is colorblind. Colorblindness is an X-linked trait, and the normal allele is dominant over the colorblindness allele. What would be the expected eyesight of their children? Daughters? Sons?

20. Punnett Square 19
Ethan is colorblind. His wife, Edna, is homozygous for the normal color vision allele. If they have eight children, what percentage of them would you expect to be colorblind. Show a punnett square and list genotypic and phenotypic ratios.