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What Is Sex Determination? (Biology)

In This Post Let’s Talk About ‘Sex Determination”, A Topic From Human Reproduction Chapter Of Biology. So, Lets’s See The Topics – What Is Sex Determination, Sex Determination In Hindi, Sex Determination System, Sex Determination X Y, Define Sex Differentiation.
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Question: What’s Sex Determination?

Answer: Sex is determined at the time of fertilization when male and female gametes fuse. Male produces two types of gametes, i.e., having X or Y chromosome and female produces the same type of gametes containing X chromosomes. The sex of the child is determined at the time of fertilization when male and female gametes fuse to form a zygote.

If a sperm (male gamete) carrying an X chromosome fertilizes an egg or ovum (female gamete) carrying an X chromosome, then the offspring will be a girl (female). This is because the offspring will have an XX combination of sex chromosomes.

If a sperm (male gamete) carrying a Y chromosome fertilizes an egg or ovum (female gamete) which has an X chromosome, then the offspring will be a boy (male). This is because the offspring will have an XY combination of sex chromosomes. Therefore, there is a 50% chance of a male child and a 50% chance of a female child.

(a) The given cross was made between pure breeding pea plants, one with round and green seeds, and the other with wrinkled and yellow seeds.
Yellow seed color and round seed shape are dominant over green seed color and wrinkled seed shape. In the F1 generation, dominant traits express itself, whereas recessive traits get suppressed.

Therefore, the phenotype of F1 progeny is round and yellow.

(b) The Different types of F2 progeny obtained along with their ratio when F1 progeny was selfed could be illustrated by the given cross:

Phenotypic ratio is: 9 : 3 : 3: 1
Round yellow seeds – 9; Round green seeds – 3
Wrinkled yellow seeds – 3; Wrinkled green seeds – 1


Tags: , Sex Determination In Hindi, Sex Determination System, Sex Determination X Y, Define Sex Differentiation.

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