In bugs and cockroaches, the sex determination takes place by
$XX$ and $XO$ chromosomes
$XX$ and $XY$ chromosomes
$ZZ-ZW$ chromosomes
$ZO-ZZ$ chromosomes
Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.
Heterogametic male condition does not occur in
Sex of a human child is determined by
Match the items of column $I$ with column $II$
Column $I$ | Column $II$ |
$(a)\; XX-XO$ method of sex determination | $(i)$ Turner's syndrome |
$(b)\; XX-XY$ method of sex determination | $(ii)$ Female heterogametic |
$(c)$ Karyotype$-45 $ | $(iii)$ Grasshopper |
$(d)\; ZW-ZZ$ method of sex determination | $(iv)$ Female homogametic |
Select the correct option from the following
Two different types of gametes in terms of the sex chromosomes, are produced by