Question

Aliens can be either green or white and can have rounded or pointed ears. A cross...

  1. Aliens can be either green or white and can have rounded or pointed ears. A cross between a green, pointed male and a green, pointed female gives the following result:

6/16 green, pointed males

2/16 white, pointed males

3/16 green, pointed females

3/16 green, round females

1/16 white, pointed females

1/16 white, round females

What are the genotypes of the parents? What principles are at work in this cross? What can you say about how sex is determined in aliens based on this result?

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Answer #1

Ans - The parents will be GgPp-male and GgPp female - where G = Green, g= white, P = pointed and p=round

GP Gp gP gp
GP GGPP GGPp GgPP GgPp
Gp GGPp GGpp GgPp Ggpp
gP GgPP GgPp ggPP ggPp
gp GgPp Ggpp ggPp ggpp

The dihybrid cross reveals the principle of Independent assortment which states that - the 2 different genes are present on 2 different loci are not linked assort independent of each other during gamer formation. So segregation of 1 gene is independent of the segregation of another gene.

In the above table Green text = green, pointed, purple text = white pointed, black text = green round and, orange text = white, round

Sex determination - Here we can see that whenever 2 dominant or 2 recessive genes (homozygous form ) are present they result in Female offspring and whenever heterozygous result in male offspring.

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