Explain how equal genetic contribution of male and female parents is ensured in the progeny. ??
Answers
Answer:
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Explanation:
In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosomes and the remaining one pair is known as sex chromosomes represented as X and Y. Females have a perfect pair of two X sex chromosomes and males have a mismatched pair of one X and one Y sex chromosome.
During the course of reproduction, as fertilization process takes place, the male gamete (haploid) fuses with the female gamete(haploid) resulting in formation of the diploid zygote. The zygote in the progeny receives an equal contribution of genetic material from the parents. Out of 23 pairs of chromosomes in progeny, male parent contributes 22 autosomes and one X or Y chromosome and female parent contributes 22 autosomes and one X chromosome.
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A male has XY gametes while the female has XX gametes. No matter what is the gender of the baby the mother contributes only the X gamete. If the X gamete of the male fusses, then the baby born is a girl. If the Y gamete fusses then the baby born is a boy.
Hence there are 50 % chances to either have a boy or a girl.
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