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?