Question

How are variations introduced in the offsprings?

Answer 1

Variations in generations:

1. A variation is a difference in the DNA composition among different individuals of species or different classes of the population.
2. The exchange of information between the non-sister chromatids during the event of crossing over during meiosis leads to great variation in DNA composition.
3. Variations occur as a result of sex chromosomes.
4. Variations in the organism's germplasm genes are heritable.
5. Mother and father contribute to the gene pattern of their offspring via their chromosomes, which undergo recombination during gametogenesis.
6. Alleles in gametes are separated and randomly united during fertilization, resulting in genetic variation.
7. Variations can also be induced by sudden changes in genes known as a mutation, where the characteristics of an organism are altered due to a change in genetic composition.
8. During meiosis, genetic recombination of genes also occurs during the crossing over of gene segments in homologous chromosomes.