Unit 3 Test Review

If tail length in cats is an incompletely dominant trait, what would the resulting offspring of a cross between a long-tailed cat (HH) and a short-tailed cat (hh) be?

• HH (long-tailed)

• hh (short-tailed)

• Hh (medium-tailed)

A horse's gametes contain 32 chromosomes. What will the diploid number of chromosomes be in the horse's body (somatic) cells?

• 32

• 64

• 16

• 30

Black rabbits are dominant over brown rabbits. A heterozyous male is crossed with a brown female. What percent of the offspring would you expect to be brown?

• 100%

• 75%

• 50%

• 0%

The cellular process of creating two new DNA molecules from one original copy is called replication. Which statement is the BEST description of this process?

• DNA opens up and RNA copies it.

• DNA opens up and completely unwinds to make two new molecules.

• RNA opens up the DNA and uses each strand as a template for a new strand.

Given the sequence of DNA nucleotide bases TAGTAGTAG, give the complementary strand of mRNA produced during transcription.

• AAGGUAGUA

• AAUCGGAAC

• AUCAUCAUC

• GAGGAGGAG

Which of these is a segment of DNA that contains the information necessary to produce a protein?

• a base

• a gene

• a codon

• a chromosome

For plants and other organisms to develop differences among their respective species the alleles of their genes must contain variations. What is the original source of these variations?

• Mutation

• Crossing over/ genetic recombination

• Random fertilization

• Independent assortment

Which is an ADVANTAGE of sexual reproduction?

• Two parents are required.

• Only one parent is required.

• It leads to genetically diverse offspring.

Among a species of butterflies, the color blue (B) is a dominant trait. Yellow color (b) is a recessive trait. If a pure blue butterfly (BB) mates with a pure yellow (bb), what will the offspring look like?

• They will all be blue.

• They will all be yellow.

• Half will be blue and half will be yellow.

• About 75% will be blue and 25% will be yellow.

A man with type A blood marries a woman with type B. Their offspring all have type AB blood. The pattern of inheritance is called

• codominance.

• sex-linkage.

• crossing over.

• incomplete dominance.