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WorksheetsSex-Linked Traits
Total questions: 30
Worksheet time: 41mins
Which of the following genotypes shows a CARRIER for a trait?
XBXb
XbXb
XBXB
XbY
Colorblindness is a recessive X-linked disorder.
Which genotype represents a male with normal vision?
XN YN
Xn Yn
XN Y
Xn Y
What is 1 examples of an X-linked genetic disorder?
Huntington's Disease
Down's Syndrome
Colorblindness
Diabetes
Huntington's Disease is an autosomal dominant disorder. What would the genotype of an affected person be?
Hh
hh
HH
none of these
A gene that is located on 1 of the first 44 chromosomes is called _____.
autosomal
x-linked
dominant
recessive
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
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
whether the mother's egg contains an xx or xy
What would the genotype be of a colorblind male?
XNY
XNYn
XnY
XnYn
How many recessive genes does a carrier female have for colorblindness?
1
2
0
3
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%
The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?
0%
25%
50%
100%
Which best explains why males cannot be carriers of X-linked traits?
Males only have one X chromosome
Males have two copies of the X chromosome
Males can be heterozygous for a particular trait
Males do not have an X chromosome
A woman who is a carrier for the sex-linked trait hemophilia has children with a man with hemophilia. What percentage of offspring would be expected to have hemophilia?
0%
25%
50%
75%
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 X r ?
male with white eyes
female with red eyes
male with red eyes
female with white eyes
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
Which genotype represents a female who is a carrier for hemophilia?
Which genotype represents a male with hemophilia?
What chance will a boy will be colorblind?
100%
50%
25%
0%
Who is more likely to have an X-linked trait?
Males
Females
Both males and females
(a) are more likely to have an x-linked trait because males have only (b) X chromosome. Females can be (c) of an X-linked trait because they can be (d) for the trait since they have (e) X's.
Which of the following genotypes shows a CARRIER for a trait?
XBXb
XbXb
XBXB
XbY
X and Y are (a) chromosomes. Females are (b) and males are (c) .
In fruit flies, eye color is a sex-linked trait. Red (R) is dominant to white (r).
Which genotype shows a female fly with white eyes?
XRXr
XRXR
XrXr
Which genotype shows a male with white eyes?
R = Red, r= white
XrY
XRY
Match the following. H= no hemophilia, h = hemophilia
Male without hemophilia
XHY
Female with hemophilia
XhXh
Female Carrier
XH Xh
Male with hemophilia
XhY
Female who is NOT a carrier
XHXH
The following punnett square depicts the x-linked cross of a female who carries hemophilia with a man showing no symptoms. Fill in the genootype represented by the blank box in the punnett square.
XH XH
Xh XH
XH Y
Xh Y
