The larvae of mosquitoes die when oil is spread on the water. Why does it happen? Give a proper reason.

How does the study of genetic disorders such as pku biologists understand normal alleles?

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of

Which of these is not a nucleotide base found in dna?