'This is your Captain speaking.
We have a small problem and all four engines have stopped. I trust you're not in too much distress.' The ice-cool words of a BA pilot at the start of his epic battle to save 263 lives over a shark infested ocean.
Humiliation for Saudi Arabia as it's 'forced to scale back $1.5trillion plans for 106-mile-long city The Line to just 1.5miles with workers already being laid off at desert construction site'
Stunning concept images released by Saudi Arabia showed a vast, mirrored structure cutting through the desert near crystal blue ocean waters. It is not clear what the project will look like scaled back.
DNA Differences between Biological Male and Biological Female:
Mitochondrial Genomes
Mitochondrial genomes are inherited solely from mothers (biological females).
Fathers (biological males) do not transmit their mitochondrial genomes to their children.
Nuclear Genomes
The nuclear genome represents an amalgamation of DNA sequences inherited from each parent.
Male & Female Chromosomes
Biological Sex
Biological sex is typically determined by the combination of sex chromosomes inherited from both parents.
Females typically* have two X chromosomes (XX),
Males typically have one X and one Y chromosome (XY).
Fertilisation - Male or Female
It is the contribution of the male during fertilisation that determines the genetic sex of the offspring.
If a sperm carrying an X chromosome fertilises an egg, the resulting combination is XX, leading to a female offspring**.
If a sperm carrying a Y chromosome fertilises an egg, the combination is XY, resulting in a male offspring.
Swyers Syndrom
Girls with Swyer syndrome (1 in 80 thousand) have an XY chromosomal makeup (as boys normally do) instead of an XX chromosomal makeup (as girls normally do). Despite having the XY chromosomal makeup, girls with Swyers syndrome look female and have functional female genitalia and structures including a vagina, uterus and fallopian tubes.