We have a population of snakes. They are either all black or black with red stri

ID: 255670 • Letter: W

Question

We have a population of snakes. They are either all black or black with red stripes.

We make the following crosses to help us determine the gene interaction:

A cross between the solid black snakes and the striped snakes results in a 1:1 ratio of solid black to striped snakes among the offspring.

A cross between two striped snakes results in progeny in the ratio of 2 striped for every 1 solid black.

Assume that these outcomes are manifested by genetic differences that occur at only one bi-allelic locus.

Then, from these results, we can determine the mode(s) of gene interaction. Please indicate what the mode(s) is/are by selecting from the list below.

Pleiotropy

Codominance

Complete dominance

I couldn't find this question posted anywhere on the internet, so I can't figure it out.

Incomplete dominance

Recessive lethality

Pleiotropy

Codominance

Complete dominance

I couldn't find this question posted anywhere on the internet, so I can't figure it out.

Incomplete dominance

Recessive lethality

Answer:

Codominance

Recessive lethality

Explanation:

Solid black = BB

Black with red stripes =Bb

Red = bb (lethal)

solid black snakes (BB) X striped snakes (Bb)---Parents

A cross between two striped snakes results in progeny in the ratio of 2 striped for every 1 solid black.

Striped snakes (Bb) x (striped snakes(Bb)----Parents

Striped (2) : Solid black (1)

B b B BB(black) Bb (striped)

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