Question

how many type and in which ratio the gametes are produced by a dihybrid heterozygous​

Answer 1

The cross between two homozygous parents considering two pairs of contrasting alleles is called as dihybrid cross e.g., YYRR (yellow and round ) is crossed with yyrr (green and wrinkled). The gametes formed are YR and yr. After fertilisation, the F1 heterozygote will be formed i.e YyRr (yellow and round). On selfing F1 we get two possible combinations i.e YR, Yr, yR, yr. Therefore four types of gametes are formed in the ratio of 1:1:1:1.

Answer 2

four types

Therefore four types of gametes are formed in the ratio of 1:1:1:1. Note: A hybrid organism is one that is heterozygous, which means that it carries two different alleles at a particular genetic position or locus. Hence, a dihybrid organism is one that is heterozygous at two several genetic loci.