Sex Determination

To understand the answer, let's clarify the concepts:

• Homogamety: When a sex has only one type of sex chromosome in their gametes (eggs or sperm). They produce only one kind of gamete with respect to sex chromosomes.
• Heterogamety: When a sex has two different types of sex chromosomes in their gametes. They produce two kinds of gametes with respect to sex chromosomes.

Now, let's analyze the given examples:

• XO type: In this system, females have two X chromosomes (XX), and males have only one X chromosome (XO). The "O" indicates the absence of a second sex chromosome. Therefore, males produce two types of gametes: one with an X chromosome and one with no sex chromosome (O). This means males are heterogametic.
• XY type: In this system, females typically have two X chromosomes (XX), and males have one X and one Y chromosome (XY). Therefore, males produce two types of gametes: one with an X chromosome and one with a Y chromosome. This means males are heterogametic.

Therefore, both XO and XY types of sex determination are examples of Male Heterogamety.

In species with male heterogametic sex determination, the male produces two different types of gametes: one containing an X chromosome and the other containing a Y chromosome. This is in contrast to the female, who produces only one type of gamete (X chromosome) in species where males are heterogametic.

This difference in the type of gametes produced by males is why they are referred to as producing dissimilar gametes.

The correct answer is (D) : Males parent produces dissimilar gametes..