Sex-Linked Genetic Disorders Flashcards
What makes a characteristic sex-linked?
If the allele that codes for the characteristic is located on a sex chromosome (X or Y).
Which is bigger, the X or Y chromosome?
The X chromosome is bigger.
How many genes do the X and Y chromosomes carry?
The Y chromosome carries fewer genes, so most genes on the sex chromosomes are only carried on the X chromosome.
Why are men more likely than women to show recessive characteristics for genes that are sex-linked?
Because men only have one X chromosome, they only have one allele for sex-linked genes.
This means that the characteristic of this allele is shown even if it is recessive.
What are sex-linked genetic disorders?
Disorders caused by faulty alleles located on sex chromosomes.
What causes colour blindness?
A faulty allele carried on the X chromosome.
What is haemophilia?
A disease where the blood doesn’t clot properly.
