Biology Test Biology Genetics & Evolution 2

Question 1

Which type of RNA carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Answer

mRNA

Answer

rRNA

Answer

snRNA

Question 2

A cell has the genotype AaBb. If the two genes assort independently, what fraction of offspring from self-fertilization will be AABB?

Accepted Answer

1/16

Answer

1/4

Answer

1/8

Answer

3/16

Question 3

What is a frameshift mutation?

Accepted Answer

An insertion or deletion that alters the reading frame

Answer

A point mutation that changes one amino acid

Answer

A mutation that creates a premature stop codon

Answer

A chromosomal inversion

Question 4

Natural selection acting on quantitative traits toward an intermediate phenotype is called:

Accepted Answer

Stabilizing selection

Answer

Directional selection

Answer

Disruptive selection

Answer

Sexual selection

Question 5

Which enzyme unwinds the DNA double helix during replication?

Accepted Answer

Helicase

Answer

DNA polymerase

Answer

Ligase

Answer

Primase

Question 6

In incomplete dominance, two red snapdragons (RR) crossed with white snapdragons (WW) produce pink offspring. What is the phenotype ratio when two pink plants are crossed?

Accepted Answer

1 red : 2 pink : 1 white

Answer

All pink

Answer

3 pink : 1 white

Answer

1 red : 1 white

Question 7

Which of the following best describes allopatric speciation?

Accepted Answer

Geographic isolation separates populations until they become reproductively isolated

Answer

Two populations speciate within the same geographic area

Answer

A population becomes polyploid without geographic isolation

Answer

Species diverge due to sexual selection only