Chapter 7. 7·1–7·5 Why do offspring resemble their parents?

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 7·1–7·5 Why do offspring resemble their parents? by answering the following questions.

1.

1. In pea plants, purple flower color is dominant to white flower color. If two pea plants that are true-breeding for purple flowers are crossed, in the offspring:

one-quarter of the flowers will be purple and three-quarters will be white.

three-quarters of the flowers will be purple and one-quarter will be white.

half of the flowers will be purple and one-quarter will be white.

all of the flowers will be purple.

all of the flowers will be white.

Correct! (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

Incorrect. (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

2.

2. If, when in a heterozygous state, one allele masks the effect of the other allele, the masked allele is referred to as:

segregated

codominant

dominant

inherited

recessive

Correct! (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

Incorrect. (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

3.

3. A phenotype:

does not include an organism’s behavior.

consists of the observable properties of an individual.

does not reveal the heritability of traits.

cannot change during the course of an organism’s life.

depends on the environment rather than the genome.

Correct. (See section 7·5 Observing an individual’s phenotype is not sufficient for determining its genotype.)

Incorrect. (See section 7·5 Observing an individual’s phenotype is not sufficient for determining its genotype.)

4.

4. Gregor Mendel performed his famous experiments on:

hawkweed.

garden peas.

humans.

Punnett squares.

pigeons.

Correct. (See section 7·3 Mendel learned about heredity by conducting experiments.)

Incorrect. (See section 7·3 Mendel learned about heredity by conducting experiments.)

5.

5. The law of segregation states that:

gametes cannot be separate and equal.

eggs and sperm separate before fertilization occurs.

each of two alleles for a given trait segregate into different gametes.

an allele on one chromosome will always segregate from an allele on a different chromosome.

the number of chromosomes in a cell is always divisible by 2.

Correct! (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

Incorrect. (See section 7·4 Segregation: you’ve got two copies of each gene but put only one copy in each sperm or egg.)

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