Chapter 9 part 2

Question 1

Human geneics

WILD TYPE

Answer 1

Most common type of trait in population.
Six fingers is dominant but not wild type
CAN BE either DOMINANT or recessive

Question 2

Recessive Genetic Disorder:
Def:
Only …
EXAMPLES: 3

Answer 2

Disease cause by recessive allele.
Only get SICK if they inherit 2  recessive alleles.
ex: 
Sickle cell anemia 
allbanism
CYSTIC FIBROSIS

Question 3

CARRIER

Answer 3

Person who is heterozygous for recessive allele.

Phenotypically healthy but can pass disease to offspring.

Question 4

Dominant Genetic Disorder
How many alleles carry the disease?
Any carriers?
EXAMPLE:

Answer 4

ONE allele causes the desease.
No carries b/c heterozygous individuals are sick.
ARCHODROPIA (DWARFDISM), HUNGTINGTON DISEASE.

Question 5

Incomplete dominance:

Answer 5

Recessive allele is Not completely hidden.

Heterozygous individuals has an intermediate phenotype. EX: PINK FLOWERES

Question 6

Condominance

Answer 6

• NO RECESIVE ALLELE PRESENT
• JUST 2 DOMINANT ALLELES
• HETEROZYGOUS INDIVIDUALS HAVE BOTH TRAITS AT THE SAME TIME

EX: BLOOD TYPE AB

Question 7

PLEIOTROPHY:

Answer 7

ONE ALLELE CAUSES MANY PHENOTYPES.

SICKLE CELL ANEMIA HAS MANY SYMPTOMS AND I BENEFICIAL TO HETEROZYGOUS INDIVIDUALS.

Question 8

POLYGENIC INHERITANCE:

Answer 8

One single trait is controlled by many different genes.
skin color
lots of variations