question_answer 71)

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

Answer:

                  The ratio of chromosome number between egg and its zygote is 1 : 2- An egg is a female gamete, it has haploid number of chromosomes. During fertilization, it fuses with male gamete (also having haploid number of chromosomes) to form a zygote that has diploid number of chromosomes. Sperms and eggs are genetically different in terms of nature of sex chromosome. The sperm contain either X or Y-chromosome whereas an egg will always have an X-chromosome.