Lab: Heredity and Punnett Squares

Question 1

Having straight hair coat (S) is dominant over having curly hair coat (s). A homozygous dominant parent is crossed with a heterozygous parent. The Punnett square shows the possible genotypes of the offspring.

Revolt · Accepted Answer

B:: Ss; C:: SS

Question 2

Having straight hair coat (S) is dominant over having curly hair coat (s). A homozygous dominant parent is crossed with a heterozygous parent. The Punnett square shows the possible genotypes of the offspring.

Revolt · Accepted Answer

A: ✔ SS

Question 3

Having straight hair (S) is dominant over having curly hair (s). A heterozygous parent with straight hair is crossed with a homozygous recessive parent with curly.What is the probability that the offspring will have curly hair?

Revolt · Accepted Answer

B: 50%

Question 4

If straight hair coat (S) is dominant over curly hair (s), can two horses with straight hair coat produce an offspring with curly hair? Explain your answer.

Revolt · Accepted Answer

Yes, two horses with straight hair can produce a curly-haired offspring if both parents are heterozygous (Ss). This means each parent carries one dominant allele for straight hair and one recessive allele for curly hair. If an offspring inherits the recessive allele (s) from both parents, it will have the genotype ss and will have curly hair.

Question 5

If black hair (A) is dominant over chestnut hair (a), can two sheep with chestnut hair produce an offspring with black hair? Explain your answer.

Revolt · Accepted Answer

No, two sheep with chestnut hair cannot produce an offspring with black hair. Because chestnut hair is a recessive trait, both parents must be homozygous recessive (aa). Since neither parent carries the dominant allele for black hair (A), they can only pass the chestnut allele to their offspring, resulting in 100% chestnut-haired offspring.

Question 6

SS✔ Ssss

Revolt · Accepted Answer

B: ✔ Ss

Question 7

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

A: Yes, the offspring can have curly hair.

Question 8

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

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Question 9

✔ SSSsss

Revolt · Accepted Answer

A: ✔ SS

Question 10

SS✔ Ssss

Revolt · Accepted Answer

B: ✔ Ss

Lab: Heredity and Punnett Squares Answers

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