genes and alleles

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

• gene

• allele

• chromosome

• chromatid

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

• dominant

• recessive

• homozygous

• heterozygous

A variety or form of a gene.

• trait

• gene

• allele

• DNA

______ is the set of genes possessed by someone

• DNA
• Chromosome
• Genotype
• Phenotype

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

• Blonde Hair
• Brown Hair

Recessive Traits show up 

• Always
• Only when there are two

Dominant Traits show up 

• Always
• Only when there are two

The physical expression of a trait.

• phenotype

• genotype

• chromosome

• allele

What are used to represent dominant alleles?

• numbers

• capital letters

• lowercase letters

• greek letters

When the two alleles of a particular gene are different

• heterozygous

• genotype

• homozygous

• phenotype