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Sexual orientation. The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the individual. Prenatal hormones may be seen as the primary determinant of adult sexual orientation, or a co-factor.
Superfetation. Superfetation (also spelled superfoetation – see fetus) is the simultaneous occurrence of more than one stage of developing offspring in the same animal. [1][2][3] In mammals, it manifests as the formation of an embryo from a subsequent menstrual cycle, while another embryo or fetus is already present in the uterus.
6c —Fraternal twins with the desired trait, not expressed in their mother, are born. Preimplantation genetic diagnosis (PGD or PIGD) is the genetic profiling of embryos prior to implantation (as a form of embryo profiling), [1] and sometimes even of oocytes prior to fertilization. PGD is considered in a similar fashion to prenatal diagnosis.
June 6, 2024 at 2:56 PM. Gabourey Sidibe is a mom! On Thursday, the Empire star took to Instagram, via The Shade Room, to share that she and her husband, Brandon Frankel, have welcomed their twins ...
October 27, 2023 at 9:10 AM. Teen Mom 2 alum Kailyn Lowry is pregnant with twins nearly one year after she quietly welcomed her fifth baby. The 31-year-old revealed the news on the Friday, October ...
Swank revealed the babies' names for the first time in a sweet Valentine's Day 2024 post. She shared a photo of her twins in colorful bathing suits and matching wide-brim hats, sitting on a sandy ...
Identical or monozygotic twins share their genes, while fraternal or dizygotic twins are only as genetically similar as any other sibling pair. When twins both share a trait, they are concordant for this trait; and when they differ they are discordant. If identical twins have a higher rate of concordance for a trait than fraternal twins, it ...
Multiple birth. A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more babies. A term most applicable to vertebrate species, multiple births occur in most kinds of mammals, with varying frequencies. Such births are often named according to the number of offspring, as in twins and triplets.