Part 1

When doing dihybrid crosses, it is assumed that the traits
assort independently of one another. This is because they are on
_____ chromosomes.

Multiple Choice

homologous

different

the same

Part 2

If an individual within the parental generation was heterozygous
for both traits, what combinations of traits could their gametes
possess?

Multiple Choice

WW, Ww, ww, SS, Ss, and ss

WS, Ws, wS, and ws

WS and ws

WwSs, WWSS, and wwss

Part 3

If a parent is heterozygous for a gene, 1/2 of the time they
will contribute a dominant allele to their offspring and 1/2 of the
time they will contribute a recessive allele to their offspring.
The phenotypes of the resulting offspring will be _____ dominant
and _____ recessive.

Multiple Choice

1/4; 3/4

1/2; 1/2

all (4/4); no (0/4)

3/4; 1/4

Part 4

The probability of having an offspring with both the dominant
phenotypes for both genes is equal to the product of the individual
probabilities. This means, the probability of having a dominant
phenotype for both traits would be

Multiple Choice

4/4 x 4/4 = 16/16.

3/4 x 1/4 = 3/16.

1/2 x 1/2 = 1/4.

3/4 x 3/4 = 9/16.

Part 5

The exchange of genetic material between nonsister chromatids is
called crossing-over and occurs during which phase of meiosis?

Multiple Choice

prophase II

interphase

prophase I

metaphase I

Part 6

Select all of the following ways in which meiosis II is
different than meiosis I.

Multiple Choice

Interkinesis does not involve the replication of chromosomes,
whereas interphase does.

Crossing-over does not occur in prophase II, whereas it does
occur in prophase I.

Cells in meiosis II are haploid and cells in meiosis I are
diploid.

Sister chromatids separate in anaphase II, whereas homologous
chromosomes separate in anaphase I.

All of the answer choices are correct.

Part 7

What cells in the body are most likely to have originated
through the process of meiosis?

Multiple Choice

heart cells

sperm and egg cells

neurons

skin cells