Intro to Genetics

One section of DNA with instructions for a trait

• allele
• chromosome
• gene
• trait

A characteristic or feature determined by genes.

• allele
• chromosome
• gene
• trait

The different forms of a gene

• allele
• DNA
• gene
• trait

In humans, the number of ALLELES for a gene that come from each parent

• 1

• 2

• 23

• 46

Allele that always shows up when present 

• Dominant
• Recessive

Allele shown with an UPPERCASE letter

• Dominant
• Recessive

Allele that gets covered up by a dominant trait 

• Dominant
• Recessive

Allele shown with lowercase letters (example: hh)

• Dominant

• Recessive

When both alleles are the same

• dominant
• recessive
• heterozygous
• homozygous

Which is a homozygous dominant genotype?

• aa
• Aa
• AA
• A