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.
The normal body cell of an organism contains 28 pairs of chromosomes. The number of chromosomes present in its germ cell will be : (a) 28 (b) 14 (c) 56 (d) 42