Q1. Two black female rats were crossed with the similar brown male rat. In the resulting progeny, female A produced 8 blacks and 7 browns and female B produced 16 blacks. Give a genetic description for these results and find out the genotypes of the two black females and the brown male using allele symbols B and b.

Q2. Pentane with molecular formula C5H12 exists in three isomeric forms. One shows linear carbon chains, another has one -CH3 groups present on the third carbon atom, and third has two -CH3 groups present on the second carbon atom. What kinds of isomers are these?