Grade 10 Science: Sex-Linked Traits
Explore the principles of sex-linked inheritance, analyze Punnett squares for sex-linked traits, and understand common sex-linked disorders like color blindness and hemophilia.
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Sex-Linked Traits Worksheet
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Read each question carefully and answer to the best of your ability. Show all work for Punnett square problems.
1. Traits that are determined by genes located on the sex chromosomes are called traits.
2. In humans, the sex chromosomes are designated as for females and for males.
3. Most sex-linked traits are found on the chromosome because it is much larger and carries more genes.
1. Which of the following is a common example of a sex-linked recessive disorder?
Cystic Fibrosis
Huntington's Disease
Red-Green Color Blindness
Down Syndrome
2. Why are males more likely to express X-linked recessive traits than females?
They have two X chromosomes.
They have only one X chromosome.
The Y chromosome carries dominant traits.
They inherit traits only from their father.
1. Hemophilia is an X-linked recessive disorder. A carrier female (X^H X^h) marries a healthy male (X^H Y).
a) Draw a Punnett square to show the possible genotypes and phenotypes of their offspring.
b) What is the probability that they will have a son with hemophilia?
c) What is the probability that they will have a daughter who is a carrier for hemophilia?
1. A female can be a carrier for an X-linked recessive trait without expressing the trait herself.
True
False
2. Fathers pass their X-linked genes to all of their sons.
True
False
1. Explain why red-green color blindness is more prevalent in males than in females.
2. Can a father pass an X-linked recessive trait to his son? Justify your answer.
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