Sex Determination in Human Beings 

  • A person can have a male sex or a female sex.
  • The process by which the sex of a person is determined is called sex determination.
  • Genetics is involved in the determination of the sex of a person.
  • The chromosomes which determine the sex of a person are called sex chromosomes.
  • There are two types of sex chromosomes, one is called X chromosome and the other is called Y chromosome.
  • Somatic cells in human beings contain 23 pairs of chromosomes.
  • Out of them the 23rd pair is composed of different types of chromosomes which are named as X and Y chromosomes.

Heredity Evolution,Speciation Notes on Science For Class 10th

  • The 23rd pair contains one X and one Y chromosome in a male.
  • On the other hand, the 23rd pair in a female contains X chromosomes.
  • This means that all the eggs would have X chromosome as the 23rd chromosome,
  • While a sperm may have either X or Y chromosome as the 23rd chromosome.
  • When a sperm with a chromosome fertilizes the egg.
  • The resulting zygote would develop into a female child.
  • When a sperm with Y chromosome fertilizes the egg, the resulting Zygote would develop into a male child

Check Out the detailed notes and previous year questions here

Heredity and Evolution NCERT Solutions For Class 10th SCIENCE

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