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प्रश्न
Mention the total number of chromosomes along with the sex chromosomes that are present in a human female and a human male. Explain how in sexually producing organisms the number of chromosomes in the progeny remains the same as that of the parents.
उत्तर
The total number of chromosomes present in both human male and female is 46. Out of these, two chromosomes are the sex chromosomes. In human males, the two sex chromosomes present are X and Y, while in human female, both sex chromosomes are X.
During sexual reproduction, the new individual is formed by the fusion of gametes from both the parents. These gametes are haploid in nature, i.e. they contain only one set of the chromosomes. They are formed by the meiosis, a type of cell division which reduces chromosome number to half. When these haploid gametes fuse during fertilisation, the two nuclei of these two gametes fuse and the chromosome number is then restored to normal. Hence, the progeny formed has the same number of chromosomes as that of the parents.
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संबंधित प्रश्न
List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.
List the two types of reproduction. Which one of the two is responsible for bringing in more variations in its progeny and how?
Name the cells that secrete Testosterone
Name the liquid that contains sperms.
Describe in brief the role of testis in human male reproductive system.
Fill in the blank.
In humans, sperm production occurs in the organ ----------------.
Sketch and label human female reproductive system.
Is the woman responsible for sex-determination of child? Justify your answer.
Name the following:
Two accessory glands in the male reproductive system.
Define the following:
Parthenogenesis
Choose the Odd One Out:
