Chapter 4

Question 1

Porphyria

Answer 1

A Recessive genetic disease

• Missing enzyme
• Ex: insomnia, headache, abdominal pain

Question 2

Pleiotropy

Answer 2

Multiple effects caused by a single gene

- Ex: Porphyria

Question 3

Polygenetic Multiple Alleles

Answer 3

Different allele combinations can produce variations in genotypes
- the more alleles= more variation

Question 4

Lethal Allele Combinations

Answer 4

An allele combination that causes death

• Can occur at any stage of development
• Ex: hungtintons disease- not lethal until middle ages

Question 5

Incomplete Dominance

Answer 5

Neither gene is completely dominant over the other

Question 6

Co- Dominance

Answer 6

Different alleles from a homologous pair that are both expressed
- Ex: blood types