Genetics Principles – Lesson 5: Meiosis
5.1 Meiosis Defined
Meiosis produces gametes (egg and sperm cells).
During meiosis, hereditary information is exchanged between your maternally and paternally inherited copies of a couple of chromosomes so that you can produce brand brand brand new combinations of genes. This procedure of hereditary recombination helps you to increase variability that is genetic a species. It permits for the transmission of practically limitless combinations of genes from parent to offspring.
The ensuing gametes have actually 23 brand new chromosomes, one person in each one of the 23 pairs, representing unique combinations for the original maternal and paternal copies.
5.2 Meiosis Terminology—Homolog
Homologous chromosomes , or homologs, comprise regarding the people of any provided chromosome pair. One person in the homolog may be the chromosome through the mom in addition to other user is through the daddy.
During meiosis, homologs pair together.
5.3 Meiosis Terminology—Chromatid
A chromatid is made https://mail-order-bride.net/french-brides/ during meiosis and it is certainly one of two identical DNA strands formed after DNA synthesis.
Cousin chromatids are through the exact same chromosome, plus they are connected together during the centromere.
The classic drawing of a chromosome shaped such as the page X actually illustrates cousin chromatids.
5.4 The 2 Components Of Meiosis—Meiosis I
Meiosis is divided in to two components: meiosis we and meiosis II .
In meiosis We, each chromosome in a mobile is replicated to produce replicated cousin chromatides for each person in the chromosomes that are homologous.
Real contact between chromatids may possibly occur, leading to the synthesis of chiasmata (through the Greek khiasma: to cross).