Genetics Review

Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.

• homozygous or purebred
• heterozygous or hybrid
• twin offspring
• pairs of chromosomes

Which of the following alleles is homozygous (purebred) recessive?

• Tt
• tt
• TT
• t

Dominant alleles are represented by a:

• Male gene
• lowercase letter
• recessive trait
• capital letter

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous genes
• mutated DNA

Aa is

• homozygous (purebred)
• heterozygous (hybrid)

A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?

• 25%
• 50%
• 75%
• 100%

G = green, g = yellow
The genotype for a yellow plant is...

• GG
• Gg
• gg
• all of the choices result in yellow

What gender has an X and a Y chromosome?

• male
• female
• transgender 
• all of the above

What is the cause of some traits "skipping" a generation?

• dominant traits
• recessive traits
• mutations
• natural selection