University:
Campbell University
Course:
BIOL 342 | Genetics
Academic year:

2024
Views:

117

Pages:

2
Author:

Melvin Mahoney

Punnett Square Practice Worksheet Part A: Vocabulary - Match the definitions on the left with the terms on the right. ✓ 1, genotypes made of the same alleles A. alleles A2. different forms of genes for a single trait B. dominant B3. gene that is always expressed C. heterozygous 4. gene that is expressed only in the homozygous state 5. genotypes made of two different alleles D. homozygous E. recessive Circle the choices that are examples of ea of those words. 6. Homozygous dominant CAA KK mm Rr TT 7. Homozygous recessive ee Ff HH 00 Uu RR S5 8. Genotypes in which dominant gene must show AA Dd EE ff 9. Genotypes in which recessive gene must show aa Gg Ff Part B: Punnett Squares KK 00 Tt 10-Examine the following Punnett squares and circle those that are correct. D d d Dd dd d Dd dd D D d Dd DD d Dd Dd A a A a AAA aa a Aa a Aa Aa Aa aa 11. What do-the letters on the outside of the Punnett square stand for? parents alleles 12. What do the letters on the inside of the Punnett square stand for? offspring alleles 13. In corn plants, normal height, N, is domnant to sbort height, n. Complete these four Punnett squares showing different crosses. Then, circle all of the homozygous dominant offspring. Put an X through all the heterozygous offspring. Leave all the homozygous recessive offspring unshaded. N N N NNN NNN N N n NNA nn Nonn 14. In guinea pigs, short hair, 5, is dominant to long hair, s. Complete the following Punnett squares according to the directions given. Then, fill in the blanks beside each Punnett square with the correct numbers. a. One guinea pig is Ss and one is ss. Expected number of offspring: Short hair (SS or Ss) 2 Long hair (ss) Ss Ss b. Both guinea pigs are heterozygous for short hair. Expected number of offspring: Short hair Long hair Part C: Monohybrid Cross Problems-Make a punnett square to show your work. 15. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the offspring? Genotype heterozygous Phenotype H dominant/hornless 16. In tomatoes, red fruit (R) is dominant over yellow fruit (r). A plant that is homozygous for red fruit is crossed with a plant that has yellow fruit. What will be the genotype and phenotype of the offsprog? R Genotype heterozygous rRr Phenotype dominant/red 17. In humans, being a tongue roller (R) is dominant over non-roller (r). A man who is a non-roller marries a woman who is heterozygous for tongue rolling. Father's phenotype recessiveMother's phenotype dominant Father's genotype Y✓ Mother's genotype Rr What is the probability of this couple having a child who is a tongue roller? 50% 18. Brown eyes in humans are dominant to blue eyes. A brown-eyed man, whose mother was blue-eyed, marries a brown-eyed woman whose father had blue eyes. What is the probability that this couple will have a blue-eyed child? 25% Bb Answer the following questions by completing the punnett square. ↑

Punnett Squares Worksheet with Answers

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