Punnett Squares Question Preview (ID: 34866)


Review For Monohybrid Punnett Squares. TEACHERS: click here for quick copy question ID numbers.

1. On a separate sheet of paper show a cross between individuals that are Hh x HH , how many boxes of the Punnett square will show an offspring that is HH?
a) 1
b) 2
c) 3
d) 4

2. In humans, brown hair is dominant to blonde hair. Complete a Punnett square to show the genotypes expected for the following cross: heterozygous brown x homozygous blonde. What is the probability of getting an offspring that is homozygous brown?
a) 0%
b) 25%
c) 75%
d) 50%

3. Two individuals cross (Yy and Yy), what is the probability that an offspring will be totally recessive?
a) 25%
b) 100%
c) 50%
d) 75%

4. Grey fur is dominant to black fur in dogs. Two heterozygous dogs mate, what is the probability of getting an offspring that has a heterozygous genotype?
a) 0%
b) 25%
c) 75%
d) 50%

5. Dimples is dominant to not having dimples. One parent is heterozygous for dimples and the other doesn't have dimples. What is the probability of getting an offspring that will not have dimples?
a) 25%
b) 100%
c) 50%
d) 75%

6. An organism with a _____________________ genotype has two identical alleles for a trait.
a) recessive
b) dominant
c) homozygous
d) heterozygous

7. A Punnett square shows the combination of ________________________ that parents can pass on to offspring.
a) DNA
b) phenotype
c) alleles
d) dominant

8. Purple flowers are dominant to white flowers. A true bred purple flower crosses with a true bred white flower. How many boxes of the Punnett square will show an offspring that is homozygous recessive?
a) 50%
b) 75%
c) 100%
d) 0%

9. Which of these is not a phenotype?
a) heterozygous
b) tall
c) round seeds
d) purple flowers

10. What is the scientific study of heredity?
a) biology
b) genetics
c) heredity
d) Mendel

11. An organism with a _____________________ genotype has two different alleles for a trait.
a) homozygous
b) recessive
c) heterozygous
d) phenotype

12. Purple flowers (P) are dominant to white flowers (p). A true bred purple flower has the genotype of __________.
a) Pp
b) pp
c) dominant
d) PP

13. Tall stems (T) are dominant to short stems (t). A hybrid (heterozygous) flower has the genotype of _________.
a) Tt
b) tt
c) TT
d) dominant

14. Freckles (F) are dominant to not having freckles (f). Ana doesn't have freckles but her parents both have freckles. What are the parents' genotypes?
a) Ff and ff
b) ff and FF
c) Ff and FF
d) Ff and Ff

15. Round seeds (R) are dominant to wrinkled seeds (r). A plant with round seeds crosses with a plant with wrinkled seeds. 100% of their offspring have a heterozygous genotype. What are the parents' genotypes?
a) RR and rr
b) RR and Rr
c) rr and Rr
d) RR and RR

16. Who was the founder of genetics?
a) Franklin
b) Darwin
c) Mendel
d) Watson

17. If two heterozygous individuals are mated, what percentage of their offspring will have the dominant phenotype?
a) 25%
b) 100%
c) 75%
d) 50%

18. Punnett squares can be used to predict the probability of:
a) being exposed to a contagious disease and contracting it
b) having an inherited disease or a genetically determined physical trait
c) neither of the above
d) both of the above

19. One cat carries heterozygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). What is the probability of one of their offspring having long hair ?
a) 75%
b) 50%
c) 25%
d) 100%

20. Dimples are controlled by a dominant allele on a single gene. Whitney has dimples, but her husband Alberto and son Pedro do not. What is the chance that Whitney and Alberto’s next child will have dimples?
a) 75%
b) 100%
c) 0%
d) 50%

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