A version or variation of a gene

• trait

• gene

• allele

• DNA

When an organism has two of the same alleles, it is called

• homozygous

• heterozygous

• recessive

• dominant

This type of allele is expressed whether there are one or two copies present.

• dominant

• recessive

• homozygous

• heterozygous

These types of alleles are only expressed if the organism has two copies

• dominant

• recessive

• homozygous

• heterozygous

A segment of DNA that has the ability to code for a specific trait.

• gene

• allele

• chromosome

• chromatid

B=Blonde Hair b=Brown Hair
If a person was Bb they would have

• Blonde Hair
• Brown Hair

Recessive alleles are found less frequently among organisms

• True

• False

What is the phenotypic ratio when you cross Tt with tt?

T = tall, t = short

The following ratios are for Tall : Short

• 3:1

• 1:1

• All tall

• All short

A skin cell is different from an eye cell because they contain different genes

• True

• False