Chapter 10.9 Flashcards Preview

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Flashcards in Chapter 10.9 Deck (8)
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1

Why was medels data easy to infer inheritance

because he observed characteristics determined by 

1. a single gene 

2. with 2 distinguished alleles

3. with no known effect from the environment

2

Why are some inheritances not easy to predict

1. mutiple genes

2. the environment

3

Example of how the environment can alter phenotype

1. temperature

2. alcohol

4

POLYGENIC

a phenotye reflects the activities of more than one gene

eg. male pattern baldness, eye color, height ( polygenic and environmental)

5

examples of phenotypes that are affected by both environment and are polygenic

1. height

2. skin color

3. body weight

4. intelligence

6

How can the environment affect a phenotype

Environment can affect a phenotype in a variety of ways.  Temperature can influence gene expression of temperature-sensitive alleles; infectious agents can intensify a genetic disorder; upbringing and nourishment will affect temperament and physical health

7

What is a polygenic trait?

 

A polygenic trait is one that is controlled by many genes

8