Jenny Graves – Distinguished Professor of Genetics, Los Angeles Trobe University
It’s thought the cousin and sis (who possess identical genes from their mom not their dad) developed from an egg fertilised by two various semen during the exact same moment.
The very uncommon “semi-identical” Australian twins reported a week ago will be the outcome of a unusual occasion. It’s thought the sibling and cousin (that have identical genes from their mother 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 will be the factor that is deciding bird intercourse.
There are various other fascinating areas of bird intercourse which are not distributed to people. Feminine wild wild birds appear to have some ability to get a handle on the intercourse of these chicks. And periodically a bird this is certainly 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
What exactly is it about bird chromosomes which makes bird intercourse therefore not the same as individual intercourse?
In people, cells in females have actually two copies of a sizable, gene-rich chromosome called X. Male cells get one X, and a small Y chromosome. Continue reading “The very unusual “semi-identical” Australian twins reported the other day will be the outcome of a unusual event.”