Which one ofthe following statement is true?

(1) In humans there are two pairs ofsex chromosome.
(2) A child who inherits an x chromosome from fat her will be a boy.
(3) A child who inherits an y chromosome from fat her will be a girl.
(4) A child who inherits an x chromosome from fat her will be a girl.

The sex of a male child is determined by which of the following?

(1) The length of the mother's pregnancy 
(2) The length of time between ovulation and copulation
(3) The presence of an X chromosome 
(4) The presence of a Y chromosome

Phylogeny is the study of one of the following

(1) Development of an individual. 
(2) Evolution of species.
(3) Embryonic development of an organ. 
(4) Ecological adaptation of an organism.

According to the evolutionary theory, for motion of a new species is generally due to

(1) Sudden creation by nature 
(2) Accumulation of variations over several generations
(3) Clones formed during asexual reproduction 
(4) Movement of individuals are habitat to other

Potato and runners of grass is an example of

(1) Homologous organs
(2) Analogous organs
(3) Vestigial organs
(4) Atavism