Sex linked genes

Question 1

male and female chromosome?

Answer 1

M - XY
F - XX

Question 2

X or Y linked genes

Answer 2

females are more likely to get genetic disorders as the males are missing half a chromatid

Question 3

X inactivation?

Answer 3

one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells. ensures that females, like males, have one functional copy of the X chromosome in each body cell.

Question 4

X linked disorders are more common in?

Answer 4

males

Question 5

sex chromosomes may display

Answer 5

x recessive
x dominant or
y linked pattern of inheritance

Question 6

X recessive

Answer 6

Females with with one copy of x recessive genes will be carriers

Males with one copy of x recessive genes will always have the condition as they only have one copy of the gene.

All daughters will be carriers and no sons will be affected assuming the mother isn’t a carrier

Question 7

With x recessive, what is the chance a carrier mother will pass down the gene?

Answer 7

50% chance it will be passed down, assuming the father doesn’t have it

Question 8

X dominant

Answer 8

Females have a 50% of passing this onto their offspring

if only the father is affected 100% of his offspring will inherit it as they get their fathers X

Question 9

Y linked

Answer 9

only males

occurs in all male offspring

Question 10

what is sex linkage?

Answer 10

gene expression specifically linked to the sex chromosomes

Question 11

crossing over

Answer 11

exchange of genes/DNA at the germ line level, increases genetic diversity

Question 12

autosome

Answer 12

non-sex chromosome

Question 13

a sex chromosome is called…

Answer 13

allosome

Question 14

x inactivation is called

Answer 14

lyonisation

Question 15

Skewed inactivation

Answer 15

a preference to which X chromosomes gets inactivated

Question 16

the inactivated chromosome is called…

Answer 16

Barr body