Question

Differentiate between the following
(a) Dominance and Recessive
(b) Homozygous and Hetrozygous
(c) Monohybrid and Dihybrid.

Answer 1

(a) Expression of trait in heterozygous as well as homozygous genotype is called as dominance while the trait which is expressed in homozygous genotypes only is called as recessive one.

(b) Presence of two copies of either dominant or recessive allele of same gene is called as homozygous (TT) while heterozygous refers to presence of dominant and recessive allele of a gene in same genotype (Tt).

(c) Monohybrid refers genotype heterozygous for singe trait (Tt) while dihybrid refers to the genotype heterozygous for two pairs of contrasting characters (YyRr).