The somatic chromosome complement in all human beings is

  • A
    $21$ pairs of autosomes and one pair of heterosomes
  • B
    $23$ pairs of autosomes and one pair of heterosomes
  • C
    $22$ pairs of autosomes and one pair of heterosomes
  • D
    $22$ pairs of autosomes and one pair of $XY$ chromosomes

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The fruit fly, $Drosophila \text{ melanogaster}$, has a diploid chromosome number of $8$. Its chromosome complement consists of:

Describe the process of sex determination in humans.

The human embryo contains all the genetic instructions necessary to become either male or female. The male embryo contains a master regulatory gene that acts as a biological switch,turning other genes on and off. The absence of this gene results in a female,which remains sexually immature. This master regulatory gene is located on the .....

When does sex determination occur in humans?

Select the $INCORRECT$ statement.

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