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??

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Solution

The ratio is 1:2 of chromosome number between an egg and its zygote. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.

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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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