SB3i Multiple and missing alleles Flashcards
1
Q
Describe ABO blood groups as an example of
multiple alleles for one gene.
A
The human ABO blood type alleles/trait is an example of a trait with multiple alleles. Three distinct alleles exist: allele A (IA), allele B (IB), and allele i (IO or i).
2
Q
Explain the inheritance of codominance.
A
Codominance means that neither allele can mask the expression of the other allele.
3
Q
Give examples of sex-linked genetic disorders.
A
Most genetic disorders, like cystic fibrosis, require two recessive alleles to be inherited
Another is red-green colour blindness.
4
Q
Explain why some genetic disorders are sexlinked.
A
As requires 2 recessive alleles or 2 dominant genes.
