Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

AcademicBiologyNCERTClass 10

Sexual reproduction brings about maximum variations in the offspring as it involves the fusion of two different gametes (male and female gametes) from two different individuals and the mixing of the characters through genetic recombination (crossing over).

[Extra information:

Variation means the differences present in the characteristics of the individuals of the species such as the difference in skin color, height, etc. It can be caused due to the difference in the DNA sequence responsible for the expression of the particular character.

Human height and ear lobes pattern (free and attached) are the two traits that show variation in human beings.

Variation provides uniqueness in terms of hair color, skin color, and even the shape of faces. It helps them to adapt to a particular environment and increases the chance of survival. 

For example, thermophilic bacteria are kind of variants that are resistant to extreme temperatures and have a chance of survival in high temperate zones.]

Updated on 10-Oct-2022 13:27:43