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Reproduction in organisms — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in organisms1 Mark
MCQ
Regarding fertilization which among the following statements is incorrect:
  • A
    It restores diploid condition in the zygote.
  • B
    It activates egg both physiologically and metabolically.
  • ✓
    Paternal and maternal sets contribute to the diploid number without causing any variation.
  • D
    It determines the sex of the offspring.
✓

Answer

Correct option: C.
Paternal and maternal sets contribute to the diploid number without causing any variation.
The process of fusion between haploid male nucleus and egg nucleus is known as amphimixis. It is also known as syngamy.
The process is known as fertilization which leads to formation of a diploid zygote and restores diploid condition in zygote. The statement is true.
Fertilization activates the egg physically and leads to formation of fertilization cone to prevent polyspermy.
It also brings changes in permeability.
The eggs become metabolically active and allows division of nucleus and forms embryo. The statement is true.
Sexual reproduction leads to the recombination of character in the pachytene stage of the meiosis which causes variation. So, the statement is false.
Fertilization determines the sex. Men have an $X$ and a $Y.$ So, each of their sperm carries one of the $2$ sex chromosomes, which sex chromosome is in the sperm that fertilizes the egg dictates the baby's sex. The statement is true.

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