WorksheetsIB Biology Sex Linkage
Total questions: 12
Worksheet time: 36mins
Red-green colour-blindness is a recessive, X-linked trait caused by a single gene. In marriages between a man who is colour-blind, and a woman who is a carrier, what percentage of all their children would be expected to be daughters who do not carry the trait at all?
50%
75%
0%
100%
Red-green colour-blindness is a recessive, X-linked trait caused by a single gene. In marriages between men who are colour-blind, and women who are carriers, what percentage of the sons born to these couples will not be red green colour blind?
50%
75%
0%
100%
In all conditions in which a defective gene is on the X chromosome, transmission of an allele of the condition to a male child can be:
from neither his mother nor father
only from his father
only from his mother
either from his father or his mother
Red-green colour-blindness is a recessive, X-linked trait. In marriages between a man who has normal colour vision and a woman who is a carrier of red-green colour blindness, what percentage of all the children can be expected to be sons who are colour blind?
25%
75%
0%
50%
Red-green colour-blindness is a recessive, X-linked trait. In marriages between a man who has normal colour vision, and a woman who is a carrier, what percentage of the female children can be expected to be daughters who have normal colour vision?
0%
50%
25%
100%
The pedigree diagram below shows inheritance within one family group. It shows that the trait in question is:
sex-linked dominant
autosomal recessive
sex linked recessive
autosomal dominant
The image below is a partial pedigree for the inheritance of hemophilia in the royal families
of Europe. Based upon this pedigree, the allele for hemophilia is most likely to be:
sex-linked & recessive
autosomal & recessive
autosomal & dominant
sex-linked & dominant
Which is the best explanation that Prince Sigmund of Prussia did not inherit hemophilia?
he only inherited one hemoophilia allele from his mother
he only inherited one hemophilia from his father
he didn’t inherit any hemophilia alleles
he inherited two hemophilia alleles
Colour-blindness is a recessive, X-linked trait. In marriages between a man who is colour-blind, and a woman who is a carrier, what percentage of the children can be expected to be daughters who are colour-blind?
100%
50%
25%
0%
Colour-blindness is a sex-linked trait that is uncommon in women because
women have a different gene for colour vision
the colour-blindness allele is carried by a gene on the Y chromosome
women have to receive the trait from both parents in order for it to be expressed
in women the normal allele is dominant to the colour-blindness allele
A father is heterozygous for a particular autosomal dominant trait. If his partner is homozygous recessive for the same trait, what percentage of their offspring can be expected to express the dominant condition?
0%
75%
50%
25%
If Colour-blindness is a recessive, X-linked trait. In marriages between a man who is colour-blind, and a woman who is a carrier, what percentage of the children can be expected to be sons who are not colour blind?
75%
25%
100%
50%
