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Name: _________________________________ Date: _______________ Block: A B C D 1. In garden peas, round seed coats (R) is dominant over wrinkled seed c...
Author: Abigayle Snow
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Name: _________________________________ Date: _______________ Block: A B C D

1. In garden peas, round seed coats (R) is dominant over wrinkled seed coats (r). What will the results be of a cross between a homozygous dominant plant and a recessive plant?

a) List the possible genotypes and phenotypes for the cross.

b) What are the chances of having round seeds? _____ out of _____ or _______% c) What are the chances of having wrinkled seeds? _____ out of _____ or _______% 2. In peas, yellow color (Y) is dominant to green (y). What will be the results of a cross of two heterozygous plants?

a) List the possible genotypes and phenotypes for the cross.

b) What are the chances of having yellow peas? _____ out of _____ or _______% c) What are the chances of having green peas? _____ out of _____ or _______% 3. In humans, straight toes (T) is dominant over curled toes (t). What would be the result of a cross between a recessive male and a heterozygous female?

a) List the possible genotypes and phenotypes for their children.

b) What are the chances of having a child with straight toes? _____ out of _____ or _______% c) What are the chances of having a child with curled toes? _____ out of _____ or _______%

4. In dogs, erect ears (E) is dominant over droopy ears (e). What are the results if two heterozygous dogs have a litter of puppies?

a) List the possible genotypes and phenotypes for their offspring.

b) What are the chances of having a puppy with erect ears? _____ out of _____ or _______% c) What are the chances of having a puppy with droopy ears? _____ out of _____ or _______% 5. The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the inability to roll the tongue (r). A man and his wife can both roll their tongues and are surprised to find that their son cannot. Explain this by showing the genotypes of all three persons.

a) What are the genotypes of the man, his wife and their son?

6. In humans, wavy hair (CS) results by the incomplete dominant situation of curly hair (C) and straight hair (S). What are the possible results if a curly-haired man and wavy-haired woman have children?

a) List the possible genotypes and phenotypes for their children.

b) What are the chances of having a child with curly hair? _____ out of _____ or _______% c) What are the chances of having a child with straight hair? _____ out of _____ or _______% d) What are the chances of having a child with wavy hair? ______ out of _______ or _______%

7. In iris, purple (P) is incompletely dominant over white (W). What would be the results of a cross if both parents were heterozygous pale lavender?

a) List the possible genotypes and phenotypes for the cross.

b) What are the chances of purple flowers? _____ out of _____ or _______% c) What are the chances of lavender flowers? _____ out of _____ or _______% d) What are the chances of white flowers? ______ out of _______ or _______% 8. In crocus flowers, white (W) and purple (P) colors are co-dominant, and result in a purple and white striped flower when heterozygous. What are the possible results from the cross-pollination of a striped crocus with a white crocus?

a) List the possible genotypes and phenotypes for the cross.

b) What are the chances of a purple flower? _____ out of _____ or _______% c) What are the chances of white flower? _____ out of _____ or _______% d) What are the chances of striped flowers? ______ out of _______ or _______% 9. In cattle, red (R) is co-dominant over white (W) hides. Roan is the name of the color that results from incomplete dominance. What are the possible results if a white male mates with a roan female?

a) What are the chances of having a red calf? _____ out of _____ or _______% b) What are the chances of having a white calf? _____ out of _____ or _______% d) What are the chances of having a roan calf? ______ out of _______ or _______%

10. In humans, blood type is inherited in a co-dominant pattern with both A and B being dominant over O, but co-dominant together. A man with type A blood marries a woman with type A blood. They have their first child whose blood type is O. What are the genotypes of all family members? (Remember to use the I’s: IA, IB and i)

Father’s genotype: __________ Mother’s genotype: __________ Child’s genotype: _________

11. A man with type AB blood marries a woman with type O blood, but whose father was type A blood. What genotype would you expect their first child to have?

Father’s genotype: _________ Mother’s genotype: __________ Grandfather’s genotype: __________ Child’s genotype: ________________

Child’s Blood Type: ______________

The following Punnett squares show the results of four different crosses Gregor Mendel made with pea plants. In this case, Mendel was looking at flower color with Red (R) being dominant over white (r). For each of the results listed below, write down which cross (Punnett Square ) applies. 1.

3.

RR x rr

Rr x Rr

2.

4.

RR x Rr

Rr x rr

a. He crossed a red flowered plant with a white flowered plant. His results were 126 red flowering plants and 122 white flowered plants. Which Punnett Square applies? ______

b. He crossed a red flowered plant with a white flowered plant. His results were 307 red flowering plants and 0 white flowered plants. Which Punnett Square applies? ______

c. He crossed a red flowered plant with a red flowered plant. His results were 306 red flowering plants and 110 white flowered plants. Which Punnett Square applies? ______

d. He crossed a red flowered plant with a red flowered plant. His results were 300 red flowering plants and 0 white flowered plants. Which Punnett Square applies? ______

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