The zygote would develop into a female child if the sex determining pair of chromosomes is made up of
- AOption (a)
A set of XX chromosomes
- BOption (b)
A set of YY chromosomes
- COption (c)
A set of XY chromosomes
- DOption (d)
Both XX and YY chromosomes
View answer & explanationHide answer & explanation
Correct answer
A set of XX chromosomes
Why this answer is correct
The correct answer is A set of XX chromosomes.
Key Points
- The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes.
- The sex of the child is determined by the father's chromosomes.
- 22 pairs of chromosomes are the same in both males and females, which are called autosomes.
- The 23rd pair is different in both sexes and is known as the sex chromosome.
- Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosomes.
- Hence, The zygote would develop into a female child if the sex determining pair of chromosomes is made up of a set of XX chromosomes.
Important Points
- In humans, the females have XX sex chromosomes while the males have XY chromosomes.
- Hence, The zygote would develop into a female child if the sex determining pair of chromosomes is made up of a set of XX chromosomes.
- When the X chromosome of a female unites with the X chromosome of a male, a girl will be born and when the X chromosome of females unites with the Y chromosome of a male, a boy will be born.
- Thus, the sex chromosome of males (father) determines the sex of the child.
| Mother/Father | X | Y |
|---|---|---|
| X | XX (Daughter) | XY(Son) |
| X | XX(Daughter) | XY(Son) |