The structure that is common in the embryos of mammals, amphibians, birds, fishes and reptiles and which is an evidence of their common ancestry is the

The first four children of a couple were all girls. The probability that the fifth will also be a girl is

In a population of living things, the parameters of size, height, weight and colour are examples of

The correct evolutionary sequence of the organisms represented is

To select and retain the desirable trait of large body size which a farmer has observed in his herd, the farmer needs to

A hormone secreted at IV serves to

If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be

Ovoviparity is the type of fertilization exhibited by the organism labelled

What proportion of the offspring of a cross between two heterozygous parents will exhibit the recessive condition phenotypically