Sex-Linked Genetics

Question 1

What are sex-lined traits?

Answer 1

Traits controlled by genes on either the X or Y chromosome

Question 2

Colour Blindness stats

Answer 2

X-Linked recessive trait, occurs in 8% of men and 0.04% of women

Question 3

How are Y-Linked Traits passed on?

Answer 3

From father to son, only.

Question 4

How many recessive copies of a gene does each gender need to show the trait?

Answer 4

Girls - 2 cuz of ( XX )
Guys - 1 cuz of ( XY )

Question 5

How is it possible for females to carry two X chromosomes and males only one?

Answer 5

The answer is that every cell has not one functioning X-Chromosome
In every female cell,one of the X chromosomes is condensed tightly into a structure now as a Barr Body
Either of the two X-Chromosomes can be inactive (this is random)

Question 6

Other Sex-Linked conditions

Answer 6

Haemophilia - the inability to clot blood ( common disease in European royal families, cuz incest)
Baldness