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  • (a) How is an equal genetic contribution of male and female parents ensured in the progeny? Explain. (b) Does the occurrence of a diversity of animals on Earth suggest their diverse ancestry also? Discuss this point in light of evolution.

(a) How is an equal genetic contribution of male and female parents ensured in the progeny? Explain.

(b) Does the occurrence of a diversity of animals on Earth suggest their diverse ancestry also? Discuss this point in light of evolution.

 

 

 

 
 
 
 
 

Answers (1)

(a) Equal genetic contribution of male and female presents in the progeny is ensured through the equal inheritance of chromosomes from both parents. There are 23 pairs of chromosomes in humans of which 22 pairs are known as autosomes and 1 pair is known as sex chromosomes. X and Y are two sex chromosomes in humans. Makes have a 'X' and a 'Y' chromosomes and females have 2X chromosomes.

During the process of fertilization, the male gamete (haploid system) fuses with the female gamete (haploid ovum) resulting in the formation of a diploid zygote. Zygote in progeny receives an equal amount of genetic material from both the parents.

Out of 23 pairs of chromosomes in the progeny, female parent contributes 22 autosomes and oneX chromosome and male parent contributes 22 autosomes and one X or Ychromosome.

(b) In spite of the fact that animals have a vast variety of structures, they do not have a common ancestry because common ancestry may greatly limit the extent of diversity.

Posted by

Sumit Saini

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