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

Dear student,
The ratio of chromosome number between an egg and zygote is 1:2 because an egg has 23 chromosomes and a zygote has 46 chromosomes.

Sperm is the male gamete which fuses with an egg to form the zygote. Sperm are motile whereas egg is non motile. A sperm will always carry XY chromosomes whereas an egg will always carry XX chromosomes. Also during spermatogenesis four sperms are formed whereas only one egg forms during oogenesis.
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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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