Biology Forums - Study Force

1.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. 
 
a. What is the genotype of the alien drone (male)? 

Answer: GgDD or is it GgDd?


2. 4.   In guinea pigs, white coat (w) is recessive to black coat (W) and wavy hair (v) is recessive to straight hair (V).  A guinea pig that is black with straight hair but has an unknown genotype is crossed with guinea pigs having white coats and wavy hair in a series of test crosses.  The following progeny are produced from these testcrosses: 30 Black, straight; 10 Black, wavy; 12 White, straight; and 31 White, wavy.

a.   What is the genotype of the unknown parental guinea pig?

Answer: Is it WvVv? Not sure how to figure it out


b.If these genes are segregating independently, what is the expected phenotypic ratio for the cross?  Support your assertion with a Punnett square.

Answer: is it 1:1 for white to black and 1:1 for wavy to straight? And if so why?























Make a hypothesis that explains your results.

a.) Are the genes that determine coat color and hair type assorting independently? No. Ratio would be 1:1:1:1 if they were
b.) If the genes are not assorting independently, what is the recombination frequency between them -
23/84 = 36%.

:.D :.D

Thanks for the reply. Im still a little confused as to what the answer is supposed to be though and the steps to get to the answers?

bump!