7th Grade Science Student ebook

9.2 PREDICTING HEREDITY

CHAPTER 9: HEREDITY

9.2 Section Review

1. Explain the relationship between each pair of terms:

a. gene and chromosome

b. gene and DNA

c. gene and allele

d. allele and meiosis

2. The table below summarizes four traits in humans. Use the
   information to answer questions a through d.

a. What is the phenotype of a person with a genotype of Cc?

b. What are the possible genotypes of a person with a straight

thumb?

c. A man with a genotype of FF marries a woman with a

genotype of ff. What are the possible genotypes and

phenotypes of their offspring?

d. A woman with a genotype of Cc marries a man with a

genotype of Cc. What is the probability that their offspring

will have a chin with no cleft?

3. Use the punnett square in Figure 9.12 to answer the following
   questions:
   a. What are the genotypes and phenotypes of the parents?
   b. What is the probability that their offspring will have free
   earlobes? Attached earlobes?

Trait Dominant allele Recessive allele

earlobes free (F) attached (f)

chin cleft (C) no cleft (c)

thumb straight (S) hitch hiker’s (s)

Figure 9.12: Use this punnett square

to answer question 3.

Use Figure 9.11 on the previous

page to calculate the probability

that an offspring will have one

dominant allele and one recessive

allele.