Punnet Squares Video

What is an allele in genetics?

• A cell division process

• A type of protein

• A variant form of a gene

• A type of chromosome

If an organism is heterozygous for a gene, what does this mean?

• It has no alleles

• It has two different alleles

• It has mutated alleles

• It has two identical alleles

What is the genotype of an organism with two different alleles for a trait?

• Hemizygous

• Homozygous dominant

• Homozygous recessive

• Heterozygous

What does a dominant allele do to a recessive allele?

• Modifies it

• Masks it

• Duplicates it

• Deletes it

What outcome results from a homozygous recessive pairing?

• Variable trait expression

• Dominant trait expression

• No trait expression

• Recessive trait expression

What does the presence of a dominant allele in a genotype indicate?

• The trait will not be expressed

• The trait will be expressed

• The allele will mutate

• The allele will disappear

In a Punnett square, what does each box represent?

• A genetic mutation

• A possible offspring genotype

• An offspring's phenotype

• A parent's genotype

What does a Punnett square help predict?

• Genetic outcomes

• Climate changes

• Chemical reactions

• Population growth

What is the phenotype ratio from crossing two heterozygous tall pea plants?

• 3:1

• 1:1

• 2:1

• 4:0

What is the result when two heterozygous organisms are crossed?

• A mix of homozygous and heterozygous offspring

• No viable offspring

• All offspring are homozygous

• All offspring are heterozygous