Question

What is difference between monohybrid and dihybrid inheritance(difference between law of segregation and law of independent assortment)?

Answer 1

Monohybrid cross: Monohybrid cross is a cross of two individuals with different alleles of a single trait.

Eg:-Mendel crossed pure tall plant with pure dwarf plant. He expected plants of intermediate height, in F1 generation but to his surprise all the plants were tall.

Dihybrid cross: Dihybrid cross is a cross of two individual differing in two different contrasting pair of character.

Eg: crossing of Mendel with with green pod colour (GG) and yellow seed colour (YY), resulting in the formation of offspring which were heterozygous for green pod colour and yellow seeds (GgYy).

According to Mendel’s law of segregation each gene possess two alleles and at the time of gamete formation each of these alleles segregate independently i.e. none of the alleles is affected by the presence or absence of other allele.