Linked Gene Quiz
Preview:
Look at this cross: XBXb x XBY
What proportion of the male children are colorblind?
A. 100%
B. 75%
C. 50%
D. 25%
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%
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%
An individual’s sex is determined by
A. 1 of 23 chromosomes
B. 2 of 46 chromosomes
C. 4 of 92 chromosomes
How many PAIRS of chromosomes do humans have?
A. 23
B. 46
C. 1
D. 2
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
A. XHXh
B. XhXh
C. XHY
D. XhY
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
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
How many PAIRS of sex chromosomes do humans have?
A. 23
B. 46
C. 1
D. 2
The visual representation of an individual’s chromosomes is a
A. phenotype
B. genotype
C. karyotype
D. stereotype
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
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
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
