That’s because the fresh new gender chromosomes, X and you will Y, during the guys are not homologous
An excellent homologous chromosome pertains to certainly a couple of chromosomes with the exact same gene sequence, loci, chromosomal length, and you may centromere location. An excellent homologous pair consists of one paternal plus one maternal chromosome. During the people, discover all in all, 46 chromosomes from the nucleus off a good somatic cellphone. 50 % of him or her (twenty-two autosomes + X otherwise Y-chromosome) try passed on on the dad plus the partner (22 autosomes + X chromosome), regarding the mom. For each and every maternal chromosome has actually a corresponding paternal chromosome; it couples upwards throughout the meiosis. Generally speaking, a female are certain to get 23 homologous chromosomes whereas a male often possess 22. The brand new combining up regarding homologous chromosomes throughout meiosis is very important to promote hereditary variation. Because of the genetic recombination that takes place ranging from homologous pairs within meiosis, the ensuing haploid gametes consist of chromosomes that are naturally not the same as one another. That it amplifies gene pond, and therefore, increasing the probability of acquiring genetics important to physiological physical fitness and you may survival.
Homologous chromosome definition
In biology, homologous chromosomes is actually matched up chromosomes. Read more →