$A$ couple has three daughters. What is the probability of having a son in the next pregnancy (in $,\%$)?

Which of the following statements are true with reference to the sex-determination in honeybees?
$A$. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker).
$B$. An unfertilized egg develops as a male by parthenogenesis.
$C$. $A$ male has half the number of chromosomes than that of a female.
$D$. Males produce sperms by meiosis.
$E$. Honeybees have a haplodiploid sex determination system.
Choose the correct answer from the options given below:

Two different types of gametes in terms of the sex chromosomes are produced by

Which of the following conditions correctly describes the mechanism of sex determination?

Which of the following conditions correctly describes the manner of determining the sex in the given example?

Holandric genes are present on . . . . . . .