degrees of dominance, multiple alleles, polygenic inheritance, pleiotropy Flashcards Preview

AP Biology 2014 > degrees of dominance, multiple alleles, polygenic inheritance, pleiotropy > Flashcards

Flashcards in degrees of dominance, multiple alleles, polygenic inheritance, pleiotropy Deck (10):
1

Multiple alleles

three or more alleles for a particular gene/trait

2

Polygenic inheritance

A non-Mendelian form of inheritance in which a particular trait is produced by the interaction of many genes; an additive effect of two or more genes on a single phenotype like skin color or height

3

Pleiotropy

A property in which genes have multiple phenotypic effects

4

Complete Dominance

when phenotypes of the heterozygote and dominant homozygote are identical

5

Incomplete Dominance

when the phenotype of F1 hybrids is somewhere between the phenotypes of the two parental varieties

6

Co-dominance

when two dominant alleles affect the phenotype in separate, distinguishable ways

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What is the difference between Pleiotropy and Polygenic Inheritance?

Pleiotropy: One gene causes many phenotypic effects Polygenic Inheritance: Many genes affect a singular trait

8

Epistasis

Phenotypic expression of a gene at one locus alters that of a gene at a second locus. Ex: Coat color for labrador retrievers

9

Cystic fibrosis and sickle cell disease are examples of ______

Pleiotropy because these diseases have multiple symptoms.

10

What is the most basic difference between incomplete dominance and epistasis?

In incomplete dominance, two different alleles have a genetic relationship while epistasis is the genetic relationship between two genes.