Genetics Quiz Review Worksheet With Answers (Page 2 of 5) in pdf

Punnett Squares

Round Watermelon vs. Long Watermelon

o Watermelon with round fruit is dominant over watermelon with long, oval fruit.

o Let F = round watermelon

o Let f = long, oval watermelon

o Cross a purebred round watermelon (FF) with a purebred long watermelon (ff).

1. What are the percentage odds of getting seeds that produce round watermelons? __________

2. What are the percentage odds of getting seeds that produce long watermelons? __________

3. If the seeds from this first cross are grown and the second generation is allowed to cross, is it possible to get

a long watermelon? ____________

Curly hair vs. Straight Hair

o Curly Hair is usually dominant over straight hair in humans.

o Let H = curly hair

o Let h = straight hair

o Cross a mother and father who both have curly hair, but had one parent with straight hair.

(Hint: they are both heterozygous.)

4. What are the percent odds of having a child with curly hair? _______________

5. What are the percent odds of having a child with straight hair? ________________

6. Would curly hair or straight hair be the trait that “skips a generation”? __________________

Long and Short Eyelashes

o Long eyelashes are dominant over short eyelashes.

o Assign a letter for the dominant and recessive alleles of this trait.

o Cross a mother who is Heterozygous with a father that is Homozygous recessive for this trait.

7. What are the percent odds that a child will be born with short eyelashes? __________

Dimples vs. No dimples

o Dimpled cheeks are dominant over cheeks without dimples.

o Assign a letter for the dominant and recessive alleles of this trait.

o Cross a father who is Heterozygous with a mother that is Homozygous dominant for this trait.

8. What are the percent odds of getting a child that is Heterozygous for dimpled cheeks? _________

9. What are the percent odds of getting a child that is Homozygous dominant? ____________

10. What are the percent odds of getting a child that is Homozygous recessive? ____________

11. Would a child that is Homozygous recessive have dimples or not? _____________

Sun Sneezer vs. Non-Sun Sneezer

o Although it is estimated to affect only 30% of the population, the tendency to sneeze when

exposed to bright light is a dominant trait.

o Assign a capital letter for Sun Sneezers and the same letter, but lower case for Non-sun

sneezers.

o Cross a dad that is a Sun Sneezer from a long line of sun sneezers (homozygous dominant) with a mom

that is a non-sun sneezer (homozygous recessive).

12. What are the percent odds of having a child that is a sun-sneezer? _______________

13. What are the percent odds of having a child that is a non-sneezer? _______________

Genetics Quiz Review Worksheet With Answers Page 2