Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

Explain how sex is determined in unborn babies.

seo-qna
Last updated date: 22nd Mar 2024
Total views: 389.7k
Views today: 4.89k
MVSAT 2024
Answer
VerifiedVerified
389.7k+ views
Hint: The sex of the unborn child can be genetically ascertained by determining the type of the male chromosome that gets fertilized with the female chromosome.

Complete answer:
Humans show the XY pattern of inheritance during fertilization.
-Every human being consists of 23 pairs of chromosomes. Out of these 23 pairs, 22 pairs of the chromosome are exactly the same in both males and females. Therefore, these 22 pairs of chromosomes are called autosomes.
-However, the 23rd pair of chromosomes between the males as well as females are different. They are called sex chromosomes.
-The sex chromosome for the women will have a pair of X chromosomes. On the contrary, males will have a single X and single Y chromosome.
-During sperm production as well as development(spermatogenesis), males will produce one X and a Y chromosome. In other words, 50 percent of the entire sperm production will yield X chromosome and 50 percent of the will yield Y chromosome.
-Females will produce only X chromosomes.
-During the process of fertilization, the ovum can fertilize with sperm containing either of X or Y chromosome.
-If the ovum fertilized with the X chromosome, then it results in a female baby (XX) whereas, if the ovum fertilized with the Y chromosome, then the baby formed will be a boy (XY).
The above image represents the female and male offspring formation.
seo images


Note: All the chromosomes in our body are 2n (diploid). But, ovum and sperm (gametes) or the sex chromosomes are haploid in nature. So, once fertilization occurs, the haploid ovum and haploid sperm will fuse to form a diploid zygote.