Substitution of a purine base with a pyrimidine base or vice versa is called

Female honey bees are ________ having _________ chromosomes.

Drones do not have __(i)_ and thus cannot have _(ii)_, but have a (iii) and can have _(iv)_ The correct words for (i), (ii), (iii) and (iv) respectively are

The foundation of chromosomal basis of sex determination was laid down by

Select the correct match

Heterogametic male is found in all, except

Environmental mechanism of sex determination is observed in all of the following, except

In honey bee, a male i.e. drone develops from

Select odd one w.r.t sex limited traits.

Porcupine skin is a