Chapter 10.9

Question 1

Why was medels data easy to infer inheritance

Answer 1

because he observed characteristics determined by

1. a single gene
2. with 2 distinguished alleles
3. with no known effect from the environment

Question 2

Why are some inheritances not easy to predict

Answer 2

1. mutiple genes
2. the environment

Question 3

Example of how the environment can alter phenotype

Answer 3

1. temperature
2. alcohol

Question 4

POLYGENIC

Answer 4

a phenotye reflects the activities of more than one gene

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

Question 5

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

Answer 5

1. height
2. skin color
3. body weight
4. intelligence

Question 6

How can the environment affect a phenotype

Answer 6

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

Question 7

What is a polygenic trait?

Answer 7

A polygenic trait is one that is controlled by many genes