Sex-linked traits are characteristics determined by genes located on the sex chromosomes (X and Y in humans). Because females have two X chromosomes (XX) and males have one X and one Y (XY), the inheritance patterns of these traits differ between the sexes. Typically, sex-linked traits refer to genes on the X chromosome, as the Y chromosome carries fewer genes. This means males are more likely to express recessive X-linked traits because they only have one X chromosome. Understanding the concepts of dominant and recessive alleles is essential when studying sex-linked traits. Punnett squares are often used to predict the probability of offspring inheriting these traits.
Match the term with the correct definition:
Match the numbers to the corresponding terms and definitions. For instance, if you think Term 1 (Allele) matches Definition 3 (A version of a gene), write 1-3.
Fill in the blanks with the correct term from the list: Punnett square, X chromosome, Y chromosome, recessive, dominant
A trait is considered sex-linked when the gene responsible for the trait is located on a sex chromosome. In humans, this is most often the __________. Males are more likely to express __________ sex-linked traits because they only have one copy of the X chromosome. The __________ carries fewer genes than the X chromosome. We can use a __________ to predict the inheritance of sex-linked traits. A __________ allele will only be expressed if there are two copies present (in females) or one copy present in a male.
A woman who is a carrier for hemophilia (an X-linked recessive disorder) has children with a man who does not have hemophilia. What is the probability that their son will have hemophilia? Explain your reasoning. Use a Punnett square to support your answer.
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