Sex Chromosomes and Allele Variation

Question 1

What are the 2 rules of X-linked recessive traits

Answer 1

1) Father will never pass mutant chromosome to son
2) If fathers are affected, daughters are obligate carriers

Question 1

Do all traits have 2 alleles

Answer 1

No, there are often more than 2 phenotypes, meaning there are more than just 2 alleles in genetics

Question 2

How many alleles can diploid individuals have

Answer 2

• Can only ever have 2 alleles
• One form mother, one from father

Question 3

What is a wildtype allele, whats the purpose of it

Answer 3

– The most common allele is considered the wildtype
- Allele most prevalent in population
- Shows which is mutant and normal
- Designated with superscript +

Question 4

What are mutants

Answer 4

Any alleles that are not common allele are mutants