Sex Determination

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

Why are males said to be heterogametic?

What is meaning of the term homogametic?

Why is amniocentesis for sex determination banned in our country?

What is amniocentesis?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Amniocentesis for sex determination is one of the strategies of Reproductive and Child Health Care Programme.

Reason (R): Ban on amniocentesis checks increasing menace of female foeticide.

In the light of the above statements, choose the correct answer from the options given below: 

Mr. Kapoor has Bb autosomal gene pair and d allele sex-linked. What shall be the proportion of Bb in sperms?

A man can inherit his X chromosome from :

ZZ/ZW type of sex determination is seen in

$\mathrm{XO}$ type of sex determination and $\mathrm{XY}$ type of sex determination are the examples of

Amniocentesis is a process to :

Assertion (A): In honey bees, males have no father and they cannot have sons, but they do have grand fathers and grand sons.

Reason (R) : They develop directly by parthenogenesis from unfertilised ova.

The correct option among the following is

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.

The genetic constitution of male gametes can be:

(a) 44 + XX

(b) 22 + X

(c) 44 + XY

(d) 22 + Y

Select the correct option.

"In humans, father is responsible for determination of sex of child and not the mother". Justify.

Female heterogamety is found in

Which of the following is responsible for sex of the chicks?

Male is homogametic in

In the number of insects and mammals the type of sex determination is