Principles Of Inheritance And Variation

Answer (a) Male Drosophila sp

Hybrid has one dominant and one recessive gene of a trait. The dominant gene is able to express itself. Recessive character does not appear in the presence of dominant gene.

Sickle cell anaemia is an autosomal recessive hereditary disease due to (mutated) instead of (normal) gene and -chain of haemobin has amino acid valine, instead of glutamic acid in position. The erythrocytes sickle shaped.

Types of gametes , where is number of heterozygous loci. Thus, man will produce types of gametes and woman will produce types of gametes.

Erythrocytic phase of Plasmodium fails to complete in sickle shaped RBCs, hence persons with sickle cell anaemia do not suffer from malaria.