Aim: What factors affect the expression of the gene?

The environment can play a significant role in the production of phenotypes

Talk to your partner and make a list of environmental factors that may affect the

expression of a gene (allele)

temperature caused the different phenotypes.

Temperature or water level affects the phenotype of these organisms

Darker furLeaves above water are broad, below the water-level are finely divided

Male Pattern Baldness is hereditary, you get it from your mother! The explanation is genetic and

linked to your mother's X-Chromosome. Male-pattern baldness, which is usually inherited

and also affects women, is caused by oversensitive

hair follicles. Dihydrotestosterone (DHT),

produced by the male hormone testosterone, causes the follicles to

shrink and eventually stop functioning. 

Twin Studies

What is the genetic make up of identical twins?

What have we found out about the expression of the gene when twins are separated?

'Identical Strangers' Explore Nature Vs. Nurture : NPR