Larkey Genetics

Homozygous Dominant (e.g. AA)

Homozygous Recessive (e.g. aa)

Heterozygous (e.g. Aa)

Any allele combination could result in a recessive trait.

short-legged (AA)

short-legged (Aa)

long-legged (aa)

All children genotypes are possible.

homozygous dominant (e.g. AA)

homozygous recessive (e.g. aa)

heterozygous (e.g. Aa)

It's impossible for children to have a trait that's different from both parents.

Cotton

2 alleles

2 chromosomes

the nucleus

If there is variation, one type will be likely to survive, even if the environment changes.

Variation allows individual organisms to "get used to" a new environment.

Still. No-eyed deer.

If all the organisms have the dominant trait, but some of them are heterozygous, then the trait can reappear in a later generation.

If all the organisms have the recessive trait, the dominant trait can still reappear in the population.

As long as the alleles for the missing trait are still around (in the population), it can reappear.

Susie works out a lot and gets ferocious biceps.

The instinct for Eagles to fly North in the summer

When a population of bacteria evolves antibiotic resistance

Protective coloring of a kelp fish

Chimpanzees learn how to catch termites with a piece of grass

George Foreman

Gregor Mendel

Howie Mandel

Fyodor Dostoevsky

In the nucleus

in the cytoplasm

in the genes

in the cell membrane

2 genes make an allele

2 alleles make a gene

A gene controls which trait an organism will have

An allele can be dominant or recessive