Q28 of 167 Page 192

(b) What sizes of plants are produced if both parents have genes Tt?

(b) When both parents have same genes Tt and Tt and they are made to cross bred, we get a phenotypic ratio of 3:1 of tall: dwarf. (TT, Tt, Tt, tt)

What is the genotype of (i) dwarf plants, and (ii) tall plants, whose parental cross always produces tall offspring?

If a normal human cell has 46 chromosomes, how many chromosomes will be there in a human (i) sperm cell, and (ii) zygote?

In a human, how many chromosomes are present in:

(a) a brain cell ?

(b) a sperm in the testes ?

(d) a skin cell ?

(e) a fertilized egg ?

Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor'.

(a) Give the modem name for this 'factor'.

(b) State where these factors are found in gametes.