Genetics (continued)

Colorblindness is more common in males than in females because

• fathers pass the allele for colorblindness to their sons only.
• the allele for colorblindness is located on the Y chromosome.
• the allele for colorblindness is recessive and located on the X chromosome.
• males who are colorblind have two copies of the allele for colorblindness.

Which of the following combinations of sex chromosomes represents a female?

• XY
• XXY
• XXXY
• XX

When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited...

• an allele for tallness from each parent.
• an allele for tallness from the tall parent and an allele for shortness from the short parent.
• an allele for shortness from each parent.
• an allele from only the tall parent.

Variation in human skin color is a result of ....

• incomplete dominance.
• codominance.
• polygenic traits.
• multiple alleles.

If an organism's diploid number is 12, its haploid number is...

• 12
• 6
• 24
• 3

Linked genes...

• are never separated.
• assort independently.
• are on the same chromosome.
• are always recessive.

Bacteria can be transformed by....

• RNA.
• DNA.
• Proteins.
• Carbohydrates.

DNA replication results in two DNA molecules,

• each with two new strands.
• one with two new strands and the other with two original strands.
• each with one new strand and one original strand.
• each with two original strands.

A female inherits

• one copy of every gene located on each of the X chromosomes.
• twice as many sex chromosomes as a human male inherits.
• one copy of every gene located on the Y chromosome.
• all of the same genes that a human male inherits.

A double helix structure exists for a(an)....

• protein.
• RNA molecule.
• amino acid.
• DNA molecule.