When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. This is called independent assortment.
What are the 2 things that happen during meiosis responsible for genetic variation?
Meiosis also produces genetic variation by way of the process of recombination. Later, this variation is increased even further when two gametes unite during fertilization, thereby creating offspring with unique combinations of DNA.
How does meiosis create independent assortment?
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.
What are the two main events that occur during meiosis?
Chromosomes condense, homologous chromosomes synapse, crossing over takes place, nuclear envelope breaks down, and mitotic spindle forms.
Which event during meiosis is responsible for the principle of independent assortment?
The principle of independent assortment is best illustrated by events that take place during metaphase I, during which nonhomologous chromosomes segregate independently of each other.
What are three ways meiosis leads to genetic variation?
We have seen that meiosis creates variation three ways: crossing over, mutations caused during crossing over, and independent assortment.
How does meiosis increase the genetic variation in the population?
Genetic variation is increased by meiosis
Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. … The chromosomes now have genes in a unique combination.
What is independent assortment in meiosis?
The Principle of Independent Assortment describes how different genes independently separate from one another when reproductive cells develop. … During meiosis, the pairs of homologous chromosome are divided in half to form haploid cells, and this separation, or assortment, of homologous chromosomes is random.
Which best describes the law of Independent Assortment?
The law of independent assortment was first introduced by a biologist named George Mendell. It stated that when two or more characteristics are inherited, independent assortment would happen and there would be an equal opportunity for both traits to occur together.
What happens when meiosis has a glitch?
Errors during meiosis can lead to mutations in gametes. Defective gametes that undergo fertilization may result in miscarriages or ultimately lead to genetic disorders. The most likely mistake to occur during meiosis is chromosomal non-disjunction, which results in the wrong number of chromosomes in a sex cell.