During random fertilization, a sperm cell, with over 8 million possible chromosome combinations, fertilizes an egg cell, which also has over 8 million possible chromosome combinations.
How does random fertilization affect genetic diversity?
Random fertilization increases genetic diversity.
When a male gamete and a female gamete finally meet, each is the result of an immense number of genetic possibilities created during independent assortment and crossing over. Human diploid cells have 23 pairs of chromosomes.
How does random arrangement of chromosomes contribute to genetic variation?
When cells divide during meiosis, homologous chromosomes are randomly distributed to daughter cells, and different chromosomes segregate independently of each other. This called is called independent assortment. It results in gametes that have unique combinations of chromosomes.
Does fertilization affect the variation in a population?
Genetic variation is increased by meiosis
During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA.
How does crossing over independent assortment and random fertilization lead to genetic variation?
During Prophase, crossing over takes place in meiosis 1 and during anaphase independent assortment takes place which creates a set of chromosomes that includes new combinations of alleles. A genetic variation that gets introduced by random fertilization of the gametes is produced by the process of meiosis.
What are the 3 types of genetic variation?
For a given population, there are three sources of variation: mutation, recombination, and immigration of genes.