In aliens, a glossy exoskeleton (G) is dominant to a dull exoskeleton (g).Also,

Question

In aliens, a glossy exoskeleton (G) is dominant to a dull exoskeleton (g).Also, excessive drooling (D) is dominant to no drooling (d). An alien drone (male) with a glossy exoskeleton and excessive drooling is crossed with an alien queen that is homozygous recessive for both traits. The following offspring were produced: 432 glossy and excessively drooling, 453 dull and excessively drooling.

1. What is the phenotypic ratio for the cross?

2. What is the genotype of the alien drone (male)?

3. What do we call this type of cross?

4. Draw the Punnett square to support your answer for (b).

Explanation / Answer

1. The phenotypic ratio is 1:1

2. The genotype of the alein drone (male) is GGDd

3. This type of cross is called as dihybrid test cross or two factor testcross

4.   Parents:                     GGDd (male)   x   ggdd (female)

      Gametes:                  GD         Gd                gd

                             GD x gd is GgDd                   Gd x gd is Ggdd

dihybrid test cross is 1:1 = GgDd : Ggdd

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