Name one reptile in each case where higher incubation temperature leads to the development of:

(a) Male progeny,

(b) Female progeny.

The gene for red hair is recessive to the gene for black hair. What will be the hair color of a person if he inherits a gene for red hair from his mother and a gene for black hair from his father ?

What are the four blood groups in humans?

Fill in the following blanks with suitable words :

(a) Genes always work in ......................

(b) In pea plants, the gene for dwarfness is………………………..whereas that for tallness is………………

(c) Most people have .................earlobes but some have ..............earlobes.

(d) A human gamete contains................... chromosomes whereas a normal body cell has ................... chromosomes in it.

(e) All races of man have.............blood groups.

(f) The.................chromosomes for a ...............are XX whereas that for a ......................are XY.

Which of the following represent tall plants and which represent short plants (or dwarf plants)?

(a) Tt (b) tt (c) TT

Give reason for your choice (The symbols have their usual meaning).