Genes and Alleles

A variety or form of a gene.

• trait

• gene

• allele

• DNA

An organism that has two different alleles for a trait is?

• Alleles 

• Co-Dominant

• Homozygous

• Heterozygous

What does the notation Tt mean to geneticists?

• two dominant alleles

• one dominant and one recessive allele

• homozygous alleles

• two recessive alleles

A recessive allele is written as a(n)

• lower case letter

• upper case letter

• hashtag

• smiley face

______ is the set of genes possessed by someone

• DNA

• Chromosome

• Genotype

• Phenotype

Recessive Traits show up 

• Always

• Only when there are two

What are used to represent dominant alleles?

• numbers

• capital letters

• lowercase letters

• greek letters

Which gene is heterozygous?

• TT

• Tt

• rr

• YY

Example of homozygous genes are (select two)

• FF

• ff

• Ff

Which of the following genotypes is homozygous dominant?

• A

• Aa

• AA

• aa