XO type of sex determination and XY type of sex determination are the examples of
XO type of sex determination and XY type of sex determination are the examples of
- Female Homogamety
- Male Heterogamety
- Female Heterogamety
- Male Homogamety
The Correct Option is B
Approach Solution - 1
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.
Approach Solution -2
In male heterogamety, such as in humans (XY sex determination system), males possess one X and one Y chromosome (XY), while females have two X chromosomes (XX).
This means that the male determines the sex of the offspring by passing either an X or a Y chromosome, while the female always contributes an X chromosome.
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Concepts Used:
Sex Determination
In human beings and animals, sex determination is usually conducted by hormonal differences, the combination of different chromosomes during reproduction. In human beings, males and females generally hold different gene variants and sex determination is hereditary. Sex differences involve the growth of a human's inner and outer sex organs and genitalia which plays a crucial role in Sex determination into masculinization and feminization that is by the growth of Sertoli cells in a male child and granulosa cells in a female child. As the zygote cell matures into adulthood definite things take place in sexual differentiation, that is the growth of different sex hormones, genes, reproductive glands, and long DNA molecules. The initial stages of sex differentiation in humans are somewhat similar to those of any other mammalian species' biological processes. In humans, males have a pair of XY chromosomes whereas females have a pair of XX chromosomes, and the Y chromosome of the male parent prompts testicular development like testis formation whereas X chromosomes of the male parent prompt ovarian development and form ovaries. Hence it is obvious that Father is the sex-determining factor.