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WorksheetsX-Linked Inheritance
Total questions: 12
Worksheet time: 56mins
Orange or black fur is a single, X-linked, co-dominant trait in cats. Calico cats have white fur with patches of orange and black. Is it true that calico cats can only be female?
Yes, because they have 2 'X' chromosomes, and therefore can have both the orange and black alleles (XO XB)
No, males can be calico because they can have both the alleles for orange and black (XO YB)
Yes because the trait is found on the X chromosome (XOB X)
No, males can be calico because the trait is found on the X chromosome (XOB Y)
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
