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In meiosis, one source of genetic variation is crossing-over, which is the exchange of corresponding segments of DNA between non-sister chromatids, in other words chromatids of two different homologous chromosomes. This process recombines segments of maternal and paternal DNA along the molecule. It occurs during prophase I.
Another source is independent assortment of chromosomes. This simply means that when two chromosomes separate and go to opposite poles at anaphase I, the separation of one pair of chromosomes has no influence on the separation of another pair. Even without crossing-over, one individual human could, in theory, produce more than eight million genetically different haploid cells through independent assortment. (It's a bit like dealing a hand of cards. There are many different possible combinations.)
Wiki User
∙ 15y ago
Wiki User
∙ 12y ago1) During Meiosis "crossover" can occur between chromosomes.
2) Mutation of DNA.
3) Random assortment of chromosomes during meiosis.
4) Random Fusion of gametes i.e any sperm can fuse with any egg giving variation.
Wiki User
∙ 12y agocrossing over during prophase one.
laws of segregation and independent assortment (Mendelian laws)
Wiki User
∙ 13y agoby crossing over during Prophase I and by the random combination of chromosomes that end up in the daughter cells after the first division right before Meiosis II
Wiki User
∙ 11y agoBecause of the process of crossing over that occurs in prophase I.
Wiki User
∙ 12y agoCrossing over and independent assortment
Wiki User
∙ 14y agoRecombination.
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When does meiosis play a more significant role than mitosis?
Meiosis is the reproduction of the gametes or sex cells. So I'd go with meiosis.
What process Are Gametes produced?
meiosis is the process by which gametes are formed
What are the three outcomes of meiosis?
Three outcomes of meiosis: it reduces chromosomes to the haploid number, it provides genetic variation, and it ensures the correct distribution of chromosomes into the resulting cells.
Does crossing over occur in meiosis?
yes crossing-over occurs in meiosis also known as genetic drifting
Is a type of cell division that produce gametes?
That is meiosis.
Is it true that meiosis and the joining of gametes generate genetic variation in offspring?
true
What is relationship between gametes and genetic variation?
CrossoverRandom AssortmentRandom Mutation
What does meiosis do for species?
Meosis creates gametes (reproductive cells) and allows genetic variation of the species
When does meiosis play a more significant role than mitosis?
Meiosis is the reproduction of the gametes or sex cells. So I'd go with meiosis.
Why are mitosis and mitosis similar?
Because they both result in the formantion of gametes; however there is no genetic variation in meiosis.
What process Are Gametes produced?
meiosis is the process by which gametes are formed
What is the relationship between meiosis and gametes?
The gametes are produced in meiosis.
Are gametes produced bymitosis or meiosis?
Gametes are produced by meiosis
What happens after meiosis to introduce even more genetic variation in sexually reproduced organisms?
fusion of gametes via fertilization
What is the relationship between meiosis and fertilization?
Meiosis is the replication of sexual gametes. The gametes are produced during meiosis and are used to fertilize other gametes in reproduction.
What are the three outcomes of meiosis?
Three outcomes of meiosis: it reduces chromosomes to the haploid number, it provides genetic variation, and it ensures the correct distribution of chromosomes into the resulting cells.
How does meiosis contribute to the variation in a species?
During meiosis crossing over takes place between homologous chromosomes. Thus genetic material get interchanged and 50 % new combinations are obtained after each meiotic cell division. Thus, meiosis brings heritable variation in the gametes.
