What is the process that results in more genetic diversity during meiosis?
During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
What are the 2 main processes in meiosis that generate genetic diversity?
There are two ways meiosis causes genetic diversity: recombination in prophase (meiosis I) reducing the number of chromosomes to half.
Which of the following explains why meiosis results in genetic diversity?
meiosis results in extensive genetic variation by converting a diploid cell into haploid gametes or spores faster than in mitosis. crossing over happens at a much lower frequency in meiotic cells as compared with mitotic cells. daughter cells resulting from the process of meosis are usually genetically identical.
What processes contribute to genetic diversity?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
How does recombination increase genetic diversity?
If they assort independently, the probability of each event occurring is unaffected by the other. Recombination in the form of crossing over occurs between homologous chromosomes, in order to increase genetic diversity by changing the assortment of genes.
What is the result of nondisjunction?
Nondisjunction in meiosis can result in pregnancy loss or birth of a child with an extra chromosome in all cells, whereas nondisjunction in mitosis will result in mosaicism with two or more cell lines. Aneuploidy may also result from anaphase lag.
How many sets of chromosomes do haploid cells have?
Haploid describes a cell that contains a single set of chromosomes. The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.
How many chromosomes do zygotes have?
Is a somatic cell 2n or N?
In sexually reproducing organisms, the number of chromosomes in the body (somatic) cells typically is diploid (2n; a pair of each chromosome), twice the haploid (1n) number found in the sex cells, or gametes. The haploid number is produced during meiosis.