Medical Quiz

Linked Gene Quiz


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Look at this cross: XB XB x Xb Y

What proportion/percent of the male children are colorblind?

A. 100%

B. 75%

C. 25%

D. 0%


Look at this cross: XBXb x XBY

What proportion of the male children are colorblind?

A. 100%

B. 75%

C. 50%

D. 25%


Why are men 16 times more likely to be color-blind than women?

A. to be color-blind, you must have a Y chromosome

B. to be color-blind, all of your X chromosomes must have the gene

C. color-blindness is caused by testosterone

D. color-blindness is caused by the same gene as baldness


Why is the gene for a disease or disorder more likely to be found on the X chromosome than Y?

A. The X chromosome has many more genes

B. The Y chromosome has many more genes


Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son?

A. 0%

B. 25%

C. 50%

D. 75%

E. 100%


H= normal blood clotting

h=hemophilia

XHXh x XHY

What is the probability that any of their offspring will have hemophilia?

A. 4/4

B. 3/4

C. 2/4

D. 1/4


How many PAIRS of chromosomes do humans have?

A. 23

B. 46

C. 1

D. 2


How many PAIRS of sex chromosomes do humans have?

A. 23

B. 46

C. 1

D. 2


An individual’s sex is determined by 

A. 1 of 23 chromosomes

B. 2 of 46 chromosomes

C. 4 of 92 chromosomes


Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?

A. XHXh

B. XhXh

C. XHY

D. XhY


Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?

A. XHXh

B. XhXh

C. XHXH

D. XhY


The visual representation of an individual’s chromosomes is a

A. phenotype

B. genotype

C. karyotype

D. stereotype


Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

A. XN YN

B. Xn Yn

C. XN Y

D. Xn Y




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