Chapter 14 Quiz Review

What percentage of human sperm cells carry an X chromosome?

• 0%

• 25%

• 50%

• 100%

How many chromosomes are shown in a normal human karyotype?

• 2

• 44

• 23

• 46

Which of the following statements is true?

• Females cannot have hemophilia.

• A colorblind boy’s mother must carry the gene for colorblindness.

• A sex-linked allele cannot be dominant.

• A colorblind boy’s father must carry the gene for colorblindness.

If nondisjunction occurs during meiosis,

• only two gametes may form instead of four.

• some gametes may have an extra copy of some genes.

• the gamete cannot join another to form an organism.

• the gametes redistribute chromosomes after meiosis.

Which piece of DNA would move fastest in gel electrophoresis? A segment that is

• 100 base pairs long.

• 500 base pairs long.

• 1,000 base pairs long.

• 10,000 base pairs long.

What is the role of restriction enzymes in studying the human genome?

• copying pieces of DNA

• labeling different nucleotides with different colors of dyes

• separating different pieces of DNA based on their size

• cutting large DNA molecules into smaller pieces

Why is it helpful to sequence many human genomes, instead of just one?

• Scientists can confirm that everyone’s genome is identical.

• Scientists can find how the human genome varies.

• Scientists can find out how to get rid of viral DNA from our cells.

• Scientists can provide insurance companies with everyone’s genome.

A boy who is colorblind inherited the disorder from his ____________________.

• mother

• father

• sister

• brother

A(An) ____________________ is a diagram that follows the inheritance of a single gene through several generations of a family.

• Flanagram

• karyotype

• Punnett square

• pedigree chart

Which of the following statements is true?

• males can be carriers for a sex-linked trait

• males get their sex-linked traits from their father

• males either have a sex-linked trait or they don't

• females either have a sex-linked trait or they don't