Q1. Which of the classes of RNA molecules is linked with proteins in form the large and small subunits of a cytoplasmic structure?

A) ribosomal RNA

B) transfer RNA.

C) messenger RNA

D) primary RNA transcript

Q2. In birds, males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. This locus is hemizygous in females (ZW). What will be the sex ratio in the offspring of a cross between a male that is heterozygous for lethal allele and a normal female?