Which parent determine penis size?

Humans have 23 pairs of chromosomes, of which there are 22 autosomes and one set of sex chromosomes. That last set determines the sex of a person as well as some secondary characteristics. Males inherit one Y chromosome from their male parent and one X chromosome from their female parent. Females inherit two X chromosomes, one from each parent. As someone who was a poor biology student, I shall now turn to Medical News Today to outline the effect of parents’ genes on their children. “Penis size is dependent on a combination of genes, specifically the sex chromosomes received from your parents. The Y chromosome is inherited from the father and contains the “male-determining” gene, the SRY gene. The SRY gene leads to the formation of testes and external and internal male genitalia in the embryo. However, while the presence of the Y chromosome leads to the development of the penis, it does not necessarily determine the characteristics of the penis, such as its length and girth or circumference. This may be more reliant on the X chromosome, which only comes from the mother and contains around 900 genes compared with the Y chromosome’s estimated 90 genes.” So, from the learned people at Medical News Today, it would seem penis size is largely determined by the mother. Brother from the same mother Have any males reading this looked at their brother and thought, “why is he bigger than me” or perhaps “thank God I am bigger than him”? Well, instead of thanking God, you should be thanking mom — and her influence on your X chromosome. Siblings may have varying penis sizes depending on what X chromosome they received from dear mom. Darius Paduch, the director of sexual health and medicine at Weil Cornell, explains, “many genes involved in the growth of penis and limbs come from the X chromosome. Since boys always inherit the X chromosome from the mother and the selection of that X chromosome is random, this can explain why one brother may have inherited genes for a large penis from one of the mother’s X chromosomes, but another brother inherited an average-size penis from the other.” Or perhaps anyone who has slept with brothers and noticed a significant difference in penis size between the two of them. Avoid plastics — and lavender Other factors can affect penis size — take, for example, phthalates. Aside from being a difficult word to both spell and pronounce, phthalate is a chemical substance used as plasticizers added to polyvinyl chloride (PVC) plastics for softening effects. It may also inadvertently soften the penis size. One study in Mexico examined the correlation between prenatal exposure to phthalate metabolites and penile measurements in male newborns. The study found “significant inverse associations were observed between an index of prenatal exposure to total phthalate exposure and the distance from the anus to the anterior base of the penis.” Scientists love to study penises An urban myth often repeated is that certain races have larger penises than others. The British Journal of Urology (BJU) International reviewed twenty different studies to see if this was true. They reported that the notion that penis size varies according to race is false. In the same report, they also dispelled another myth — that older men tend to have smaller penises. Their findings were that “it is not possible from the present meta-analysis to draw any conclusions about any differences in penile size across races.” So at least twenty penis studies found that race has no impact on the size of a penis.