Genetics

Front

What is the term for having two different genes for a trait?

Back

Heterozygous

Front

Which genotype represents a recessive trait?

Back

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Front

What is the expected phenotype ratio of offspring from two heterozygous tall pea plants (Tt)?

Back

75% tall and 25% short

Front

If a horse with genotype WW is crossed with a horse with genotype ww, what fraction of the offspring will have white hair?

Back

All (100%) will have white hair.

Front

What is the term for homozygous dominant genotype?

Back

BB

Front

Define 'genotype'.

Back

The genetic makeup of an organism, represented by alleles.

Front

Define 'phenotype'.

Back

The observable physical characteristics of an organism.

Front

What is a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present.

Front

What is the expected genotype ratio from a monohybrid cross of two heterozygous parents (Tt x Tt)?

Back

1 TT : 2 Tt : 1 tt