Chapter 12: Inheritance Patterns and Human Genetis

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1

Carrier

when a person has one copy of the recessive allele but don't have the disease

2

Genetic Disorder

diseases or disabling conditions that have a genetic basis

3

Autosomal

gender doesn't matter- there can be male carriers

4

Complete Dominance

dom. allele shows only
ex: dimples, earlobes, thumb

5

Incomplete Dominance

blend ex: flower color
Rr=pink

6

Codominance

diff. letters, both traits show
ex: blood type, roan cow
RW= spotted

7

x linked

disorder on the X chromosome

8

y linked

disorder on the Y chromosome

9

Sex Influenced

a trait that is caused by a gene whose expression differs in males and females

10

Polygenic

one phenotype, many genotypes
ex: hair, skin, eye color

11

Pleiotrophy

one genotype that influences many phenotypes
ex: PKU, mental retardation, marphon syndrome

12

Epistasis

interaction of genes that aren't alleles
ex: *Yellow labs* vs. brown/choc. labs

13

Multiple Allele

genes with 3 or more alleles

14

Single Allele

a single allele of a gene controls this

15

Genetic Linkage

tendency for alleles of genes on the same chromosome to be inherited together