List of top Biology Questions on Sex Determination

Assertion (A): XX – XY type of sex-determination mechanism is an example of male heterogamety.
Reason (R): In birds male heterogamety is observed as males produce two different types of gametes.

Which of the following features correctly show the mechanism of sex-determination in honey-bees?
(i) A zygote formed from the union of a sperm and an egg develops into a male.
(ii) Males have half the number of chromosomes as that of females.
(iii) The females are diploid having 32 chromosomes.
(iv) Males have a father and can produce sons.
Choose the correct option:

Assertion (A): In birds, the sex of the offspring is determined by males.
Reason (R): Males are homogametic while females are heterogametic.

In male heterogametic type of sex determination

Sex is determined in human beings

Select the incorrect statement.

The contraceptive ‘SAHELI'

The type of sex determination in honey bee is:

The permissible use of the technique amniocentesis is for

The honey bee queen copulates only once in life. It can lay both fertilised and unfertilised eggs.

Drosophila flies with $XXY$ genotype are females, but human beings with such genotype are abnormal males, it shows that

In a colony of honey bee family there are

Sex is determined in human beings