Genetics

What did Gregor Mendel study?

• The structure of DNA

• The inheritance of traits

• The function of cells

• The process of photosynthesis.

Gregor Mendel studied how traits were passed from parents to their ______.

• Siblings

• Offspring

• Neighbors

• Friends

Which of the following is an example of a homozygous gene pair?

• Bb

• BB

• bB

• Bb

Fill in the blank: A homozygous gene pair can be represented as either ___ or ___.

• A) BB, bb

• B) Bb, bB

• C) BB, Bb

• D) Bb, BB

Fill in the blank: An example of a heterozygous gene pair is ____.

• AA

• bb

• Bb

• BB

What is a trait?

• A) A type of food

• B) A characteristic

• C) A place

• D) A tool

In pea plants, yellow peas are dominant over green peas (Y=yellow, y=green). What is the expected phenotype ratio of the offspring when a heterozygous yellow plant is crossed with a homozygous green plant?

• 100% yellow

• 50% yellow, 50% green

• 75% yellow, 25% green

• 25% yellow, 75% green

In a cross between two heterozygous yellow pea plant (Yy), what percent of the offspring will be yellow?

• 0%

• 25%

• 50%

• 75%

What is incomplete dominance?

• A pattern of inheritance where one allele completely masks the other

• A pattern of inheritance in which alleles from both parents are blended

• A pattern of inheritance where alleles are not expressed

• A pattern of inheritance where alleles are identical.

What is a dominant gene?

• A gene that is hidden when the recessive gene is present.

• A gene whose trait always shows itself.

• A gene that is only visible in certain conditions.

• A gene that is never expressed.