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Short Answer Question. “Father is responsible for determination of sex of child and not the mother”. Justify. - Biology

Answer in Brief

Short Answer Question.

“Father is responsible for determination of sex of child and not the mother”. Justify.

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Solution

  1. A human male has 44 autosomes + XY sex chromosomes, whereas a female has 44 autosomes + XX sex chromosomes.
  2. During gamete formation in male, the diploid germ cells in testis undergo spermatogenesis to produce two types of haploid sperms, 50% sperms contain 22 autosomes and X chromosome while 50% sperms contain 22 autosomes and Y chromosome.
  3. In females, the diploid germ cells in ovaries undergo oogenesis to produce only one type of egg. All eggs contain 22 autosomes and the X chromosome.
  4. Thus human male is heterogametic and female is homogametic.
  5. If a sperm containing X chromosome fertilizes the egg (ovum), the diploid zygote formed after fertilization grows into a female child.
  6. If a sperm containing Y chromosome fertilizes the egg, then diploid zygote formed after fertilization grows into a male child.
  7. The sex of a child depends on the type of sperm fertilizing the egg and hence the father is responsible for the determination of sex of the child and not the mother

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APPEARS IN

Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 3 Inheritance and Variation
Exercise | Q 3.05 | Page 69
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