Genic balance theory of sex determination was proposed by

Mental retardation in man, associated with sex chromosomal abnormality is usually due to

In the hexaploid wheat, the haploid $(n)$ and basic $(x)$ numbers of chromosomes are

A person is suffering from disease phenylketonuria, which is an autosomal recessive disease. Which of these is lacking in the person?

You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose.

Number of linkage group in Pisum sativum is