Case Study 7 Test Review

Spermatogenesis produces _______ from one original cell

• One haploid cell

• Two haploid cells

• Two diploid cells

• Four haploid cells

If an animal's diploid cells have 60 chromosomes, how many chromosomes will be found in its haploid cells?

• 20

• 30

• 45

• 60

In lizards, long tails are dominant to short tails. If a homozygous long tailed lizards creates offspring with a homozygous short tailed lizard, what is the probability their child will be heterozygous?

• 0%

• 25%

• 50%

• 75%

• 100%

Answer explanation

A homozygous dominant parent (TT) and a homozygous recessive parent (tt) will only produce heterozygous offspring (Tt)

Which one of these is the best description for how we represent a female who is not affected by a trait on a pedigree?

• A shaded in circle

• A non-shaded in circle

• A shaded in square

• A non-shaded in square

If an individual has a trait caused by radiation, is this an example of inheritance or mutation?

• Inheritance

• Mutation

• Neither

In squirrels, bushy tails (B) are dominant to thin tails (b). If two heterozygous parents (Bb) produce 8 offspring, how many of their offspring would we expect to have thin tails?

• 1

• 2

• 4

• 8

Using the chart, what is the likelihood that a heterozygous type A parent and a homozygous type B parent have an AB offspring?

• 25%

• 50%

• 100%

• 0%

Which complex pattern of inheritance is being demonstrated here?

• Simple inheritance

• Codominance

• Incomplete dominance

• Polygenics

Why are sex-linked traits more common in men than in women?

• Women are less likely to inherit sex-linked recessive alleles because they have two copies of the X chromosome.

• Sex-linked traits are caused by mutations on the Y chromosome, which is only present in males.

• Women have a higher mutation rate in sex-linked genes, which makes them less likely to pass on these traits to their offspring.

• Men only have one X chromosome, so if they inherit a sex-linked recessive allele on that X chromosome, they will express the trait.

Meiosis will produce what type of daughter cells?

• Haploid

• Diploid

• Mutant

• None of the above