How does meiosis lead to genetic variability within a population?

Question

Use S. fimicola as an example.


Please help!!!!!!!! >.<

Answer 1

Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. Meiosis involves a reduction in the amount of genetic material.

Meiosis comprises two successive nuclear divisions with only one round of DNA replication.
Four stages can be described for each nuclear division.

Interphase: Before meiosis begins, genetic material is duplicated.
First division of meiosis
Prophase 1: Duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. Crossing-over can occur during the latter part of this stage.
Metaphase 1: Homologous chromosomes align at the equatorial plate.
Anaphase 1: Homologous pairs separate with sister chromatids remaining together.
Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the homologous pair.

Second division of meiosis: Gamete formation
Prophase 2: DNA does not replicate.
Metaphase 2: Chromosomes align at the equatorial plate.
Anaphase 2: Centromeres divide and sister chromatids migrate separately to each pole.
Telophase 2: Cell division is complete. Four haploid daughter cells are obtained.
One parent cell produces four daughter cells. Daughter cells have half the number of chromosomes found in the original parent cell and with crossing over, are genetically different.

Meiosis differs from mitosis primarily because there are two cell divisions in meiosis, resulting in cells with a haploid number of chromosomes.

hope you've found something useful in here:) you can go to the website below for a tutorial if you wanna know more about meiosis and you can test yourself too after going through the tutorial. enjoy learning more about biology:)))

Answer 2

in medical words differences are obesrved using random distribution and crossing over which takes position for the duration of meiosis I. This finally ends up in genetic variability. This genetic variability is "very virtually in all circumstances" for version with the enviroment..... Alsp this takes position to maintain organic and organic area of expertise of a human being.

Answer 3

you should read up on the term crossing over... it occurs during prophase 1 of meisosis. Then go to the wiki page on S. fimicola and everythign will make a lot of sense. Good luck

Answer 4

b/c when the chromosomes are sorted out to arrive at being haploid, they are sorted randomly.

Answer 5

how does prophase divide