Question

Two different genes encode enzymes that perform different biochemical functions.

1.Singly, mutations in these two different genes cause two different phenotypes. When combined, a double mutant individual (carrying mutations in both genes) has a new phenotype!

These genes are described as:

Group of answer choices

a.Duplicate genes

b.Pleiotropic genes

c.Additive genes

d.Lethal genes

2.

he term for a mutation that is loss-of-function, and results in zero gene activity is:

Group of answer choices

a.Hypermorphic mutation

b.Hypomorphic mutation

c.Null mutation

d.Neomorphic mutation

e.Antimorphic mutation

3.Rous discovered a tumor-inducing agent in chicken. We now know that what he described as a “minute parasitic organism” actually was:

Group of answer choices

a.Bacteria cells

b.Chicken cells

c.Retroviruses

d.Cellular DNA

4.Place the following steps in their proper order for retrovirus replication.

A) Integration of viral genome in host

B) Transcription produces RNA viral genome

C) Reverse transcription produces DNA viral genome

Group of answer choices

A, B, C

A, C, B

B, A, C

B, C, A

C, A, B

C, B, A

Answer 1