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WorksheetsX-Linked Traits
Total questions: 20
Worksheet time: 56mins
Colorblindness is more common in males than in females because......
fathers pass the allele for colorblindness to their sons only
the allele for colorblindness is located on the Y chromosome
the allele for colorblindness is recessive and located on the X chromosome
males who are colorblind have two copies of the allele for colorblindness
Colorblindness is a recessive X-linked disorder.
Which genotype represents a male with normal vision?
XN YN
Xn Yn
XN Y
Xn Y
Duchenne muscular dystrophy is a recessive X-linked disorder.
According to the Punnett square, what percentage of offspring will have the disorder?
0%
25%
50%
100%
Hemophilia is a recessive X-linked disorder. According to the Punnett square, which is NOT true?
50% of all offspring will have the disorder
50% of male offspring will not have the disorder
25% of female offsprings will have the disorder
the mother does not have the disorder but is a carrier
Males are more likely to suffer from a sex-linked disease or disorder because...
males are the weaker sex
males have less DNA
males have 1 X chromosome, so the disorder is more likely to be expressed
females are the stronger sex
What chromosome letter pairs are used to represent males and females
XX = female and YY = male
XX = female and XY = male
XX = male and YY = female
XX = male and XY = female
The biological sex of a child is determined by
whether the father's sperm contains an x or y chromosome
whether the mother's egg contains an x or y chromosome
the age of the parents
Which genotype represents a female who is a carrier for hemophilia?
Which genotype represents a male with hemophilia?
In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R Y ?
male with white eyes
female with white eyes
male with red eyes
female with red eyes
What is the genotype of a white eyed male fly?
X R X r
X R X R
Xr X r
X r Y
XR Y
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?
0%
25%
50%
75%
100%
A human male will normally transmit the genes
on his X chromosome to
his sons
his daughters
half of his sons and half of his daughters
all of his children
When a woman, heterozygous for normal vision, mates with a colorblind male, what percentage of their offspring could be colorblind?
25%
50%
75%
0%, but all would be carriers.
