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

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: 1. 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. 2. 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. Recessive lethality I couldn't find this question posted anywhere on the internet, so I can't figure it out. ? codominance Pleiotropy Complete dominance Incomplete dominance

Explanation / Answer

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 (solid black) Bb (black with red stripes)

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