Sex Determination

Which of the following organisms show heterogametic nature in one of their sex?

Males of silkworm Bombyx mori are known to produce more silk per unit quantity of leaf consumed. Hence, they are preferably bred in sericulture industry. Which of the following genotypes should be crossed in order to get maximum fraction of male insects?

Note: ${\mathrm{SL}}_1$ and ${\mathrm{SL}}_2$ are sex-linked recessive lethal mutations.

For given chart, choose correct option for '$X$', ' $Y$ ' and '$Z$ '.

X-body was first reported by:

Which type of sex-determination is found in most insects?

Identify the incorrect match:

Males are heteromorphic and heterogametic in the case of

Haplo-diploid insects have diploid females from fertilized eggs but haploid males from unfertilized ones. Such a haploid male with red eyes is crossed with a white-eyed female. Assuming that the red-eye colour mutation is dominant over the white-eye colour, which one of the following statements is true?

Which of the following is an example of ZW-ZZ type of mechanism of sex determination?

The chromosomes responsible for the determination of sex in humans are ______.

Barr body is found in humans. It is associated with _____.

The chromosomes in human males and females are represented as _____ and _____.

Match the following lists:

Match the following

When sex determination occurs after fertilization, it is called __________.

Sex-determination in human being is _____.

In Drosophila, the sex is determined by:

The number of autosomes in human is

Observe the given figure carefully.


Which among the following shows this type of sex determination?

In grasshopper (A) and birds (B), the mechanism of sex determination is?