During intimate reproduction, one chromosome into the each homologous couple are contributed from the mommy plus the other regarding the father
A set of homologous chromosomes includes chromosomes regarding equivalent size, gene position, and you will centromere place. Chromosomes are very important molecules while they incorporate DNA and you may genetic guidelines into the guidelines of all of the cellphone activity. However they carry family genes one to influence individual traits that may be passed on courtesy reproduction.
Peoples Karyotype
A person karyotype suggests the whole number of peoples chromosomes. For every single human tissues incorporate 23 pairs from chromosomes or 46 total. All chromosome few is short for a collection of homologous chromosomes. When you look at the a beneficial karyotype, discover twenty two pairs regarding autosomes or non-sex chromosomes and one group of intercourse chromosomes. The new intercourse chromosomes in people (X and you may Y) and you may females (X and you can X) are homologs.
Mobile Breeding
There are 2 ways that a cellular normally split and you may duplicate that is mitosis and meiosis. Mitosis precisely copies a cell and you may meiosis brings unique muscle. These methods of cellular reproduction are necessary having preserving person lifetime. Mitosis allows an excellent zygote to reproduce up until a human is formed and you will meiosis produces new gametes which make fertilization, and that zygotes, possible to start with.
Mitosis
Cellular division by mitosis replicates tissue to have repair and you may increases. Prior to mitosis initiate, chromosomes was duplicated to ensure that per mobile produced retains the first number of chromosomes just after division (that it count is actually doubled right after which halved). (περισσότερα…)