What would be the ratio of the chromosome no between an egg and zygote how is sperm genetically different from the egg.

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Solution

The ratio of the chromosome number of egg and zygote is 1:2 because the zygote matures into an embryo with a halving of the number of chromosomes.

Sperm Egg
It is a male gamete. It is a female gamete.
It has an XY sex chromosome. It has a XX sex chromosome.

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Question 48
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg??

The sperm and the egg make different contributions to zygote. Which of the following statements about their contributions are true?

(i) Sperm contributes most of the mitochondria.

(ii) Egg contributes most of the cytoplasm.

(iii) Both sperm and egg contribute haploid nucleus

(iv) Both sperm and egg contribute centrioles.

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