When different alleles of the same gene are present on an individual, the individual is a
Heterozygous
Diploid
Homozygous
mosaic
Frequency of Down’s syndrome increases when the maternal age is
Polydactyly in man is due to
The best method to improve the genetic quality of mankind is
In human female, barr bodies are formed by
The movement of a gene from one linkage group to another is called