Jenny Graves – Distinguished Professor of Genetics, Los Angeles Trobe University
It’s thought the bro and sibling (who’ve identical genes from their mom although not their daddy) developed from an egg fertilised by two various semen in the exact same minute.
The very uncommon “semi-identical” Australian twins reported the other day would be the outcome of a uncommon occasion. It’s thought the cousin and sibling (that have identical genes from their mom not their dad) developed from an egg fertilised by two various semen in the exact same minute.
In people, it is the semen that determines whether an embryo is pressed along a male or female development path. However in wild wild wild birds, it is one other means around. Eggs would be the determining element in bird sex.
There are some other fascinating facets of bird intercourse that aren’t distributed to people. Feminine wild wild birds appear to have some ability to get a grip on the intercourse of the chicks. And sporadically a bird that is feminine on a single male and side on the other side is produced – like in current reports with this cardinal in america.
X and Y, Z and W chromosomes
Just what exactly will it be about bird chromosomes which makes bird intercourse therefore not the same as individual intercourse?
In people, cells mumbai women for marriage in females have two copies of a big, gene-rich chromosome called X. Male cells get one X, and a small Y chromosome. „The very unusual “semi-identical” Australian twins reported a week ago would be the results of an event that is rare.“ weiterlesen