cross between hemophilia male and normal female ? draw the chart according to Mendel's
Answers
Answer:
Explanation:
In humans and other mammals, biological sex is determined by a pair of sex chromosomes: XY in males and XX in females.
Genes on the X chromosome are said to be X-linked. X-linked genes have distinctive inheritance patterns because they are present in different numbers in females (XX) and males (XY).
X-linked human genetic disorders are much more common in males than in females due to the X-linked inheritance pattern.
Introduction
If you’re a human being (which seems like a good bet!), most of your chromosomes come in homologous pairs. The two chromosomes of a homologous pair contain the same basic information – that is, the same genes in the same order – but may carry different versions of those genes.
Are all of your chromosomes organized in homologous pairs? The answer depends on whether you’re (chromosomally) male.
A human male has two sex chromosomes, the X and the Y. Unlike the 444444 autosomes (non-sex chromosomes), the X and Y don’t carry the same genes and aren’t considered homologous.
Instead of an X and a Y, a human female has two X chromosomes. These X chromosomes do form a bona fide homologous pair.
Because sex chromosomes don’t always come in homologous pairs, the genes they carry show unique, distinctive patterns of inheritance.
Sex chromosomes in humans
Human X and Y chromosomes determine the biological sex of a person, with XX specifying female and XY specifying male. Although the Y chromosome contains a small region of similarity to the X chromosome so that they can pair during meiosis, the Y chromosome is much shorter and contains many fewer genes.
To put some numbers to it, the X chromosome has about 800-900800−900800, minus, 900 protein-coding genes with a wide variety of functions, while the Y chromosome has just 60-7060−7060, minus, 70 protein-coding genes, about half of which are active only in the testes (sperm-producing organs)^{1,2,3,4}
1,2,3,4