Intro to Genetics/Monohybrid Crosses

having two of the same alleles for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

having two different alleles for a trait (sometimes called hybrid).

• protein
• homozygous
• heterozygous
• genotype

One possible version of one gene, represented by letters is a...

• trait

• allele

• physical appearance

• phenotype

What is a genotype?

• The gene that determines a trait; represented by letters.

• The physical description of a trait; what can be "seen."

• The trait that shows, making the other trait.

• The trait that is masked by a dominant trait.

What is a heterozygous trait? (2 correct answers!!!)

• A trait that has one dominant gene and one recessive gene.

• A trait that has two dominant genes.

• A trait that is represented by two capital letters or two lower case letters.

• A trait that is represented by one capital letter and one lower case letter.

Brown eyes are a dominant trait.

Blue eyes are a recessive trait.

B = Brown eyes

b = Blue eyes

If a person has homozygous recessive blue eyes, what would be the genotype?

• BB

• Bb

• bb

• b

A phenotype is the ______ expression of a trait.

• letters

• physical

• genes

• genome

If dad has alleles "TT" for the "taste" gene, then he would be called:

• Homozygous Recessive

• Homozygous Dominant

• Heterozygous

• Heterozygous Dominant

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?

• 100% Gg
• 50% GG, 50% Gg
• 25% GG, 50% Gg, 25% gg
• 75% Gg, 25% gg