Question

The white eyes w gene of Drosophila is located on the X chromosome. A fly will be ‘hemizygous’ for the w gene if it has which karyotype?

Group of answer choices

XX

XXY

XY

Which of the following determines the correct segregation of X and Y chromosomes during meiosis I in humans (males):

Group of answer choices

Lack of homology between X and Y

Presence of “pseudoautosomal” (PAR) regions shared by X and Y

The presence of the SRY gene

Red-green color blindness is an X-linked recessive trait. A man and wife, both with normal vision, have a color-blind daughter. What genetic situation caused this?

Group of answer choices

a) The man and wife are both carriers

b) The man is not the genetic father

c) The mother is a carrier

Both (a) and (b)

Your parents are healthy, but they are both carriers of an autosomal recessive trait/disease. You are healthy, too. What is the probability that you are also a carrier of that disease?

Group of answer choices

1/4

1/2

2/3

3/4

Answer 1

1) correcorrect answer : XY

Hemizygous is given so there is no Chance of homozygous or heterozygous so for w genes there is no homozygous or heterozygous then 3 rd option is correct

2) correct answer: presence of "pseudoautosomal regions" (PAR) shared by X and Y

3) correct answer : option b and c

Man is not genetic father and the mother is carrier

Red-green color blindness is X-linked recessive disorder

4) Correct answer : option b ( 1/2 or 50% )

Carriers are heterozygous Carriers