Sex-Linked Traits Flashcards
(10 cards)
What are sex chromosomes?
Sex chromosomes are the chromosomes that determine an organism’s sex (X and Y in humans).
What are X-linked traits?
X-linked traits are traits determined by genes located on the X chromosome, such as color blindness and hemophilia.
What are Y-linked traits?
Y-linked traits are traits determined by genes on the Y chromosome, such as male infertility.
Why are males more likely to express X-linked recessive traits?
Males have only one X chromosome (XY), so they only need one copy of a recessive allele to express the trait.
Why are females less likely to express X-linked recessive traits?
Females have two X chromosomes (XX), so they need two copies of the recessive allele to express the trait.
What is an example of an X-linked recessive disorder?
Color blindness, which is more common in males due to its inheritance pattern.
What happens if a male inherits a defective gene on his X chromosome?
Since males only have one X chromosome, they will express the trait if the gene is defective.
Can a father pass an X-linked trait to his son?
No, fathers pass their Y chromosome to their sons, not their X chromosome.
Can females be carriers of X-linked recessive traits?
Yes, females can carry one recessive allele without expressing the trait, as they have another normal X chromosome.
What are some common X-linked traits in humans?
Hemophilia, Duchenne muscular dystrophy, and red-green color blindness.
