genetics chapter 4.2

who came up with sex linked characteristics?

Thomas Hunt

Are white eyes in fruit flies inherited as an autosomal recessive trait?

no they are inhereted through x-linked inheritance

is color blindness a dominant or recessive trait?

recessive

dosage compensation `

compensating the differential copy number of X chromosomes in male vs. female

how do mammals do dosage compensation?

genes on one of the X chromosomes in the female are randomly inactivated

what are the three ways dosage compensation can be accomplished?

1. doubling the activity of the genes on the X chromosome of the male
2. halvin the activity in the genes on both of the X chromosomes of the female
3. genes on one of the X chromosomes of the female are randomly inactivated

barr body

Inactivated X chromosome

hemophilia is an X-linked recessive disease in humans. A woman with hemophilia mates with a man who exhibits normal blood clotting. what is the probability that their child will have hemophelia?

50%

which side of the family are Y-linked characteristics inherited from?

the father's side

can Y-chromosomes be inherited from the mothers side?

no

if a color-blind female has children, what do we know about all of her sons?

all sons will be color blind

males and females express the same amount of X-chromosome genes despite the fact that females have more X-chromosomes. Animals approach this problem in different ways. Which of the following is an example?

all of the above

how many Barr bodies are present in an individual with Kleinfelter syndrom (XXYY)?

1