Ch 3-1 Mendel's Work

Front

What is a dominant allele?

Back

A dominant allele is an allele that is expressed when present, even if only one copy is present.

Front

What is a recessive allele?

Back

A recessive allele is an allele that is only expressed when two copies are present.

Front

What is the F1 generation?

Back

The F1 generation refers to the first generation of offspring produced from a cross of two parental organisms.

Front

What is the F2 generation?

Back

The F2 generation refers to the second generation of offspring, produced by crossing two F1 individuals.

Front

What ratio of traits did Mendel observe in the F2 generation?

Back

Mendel observed a 3:1 ratio of dominant to recessive traits in the F2 generation.

Front

What does it mean for a plant to be a hybrid?

Back

A hybrid plant has two different alleles for a trait, such as Tt for stem height.

Front

What is the significance of the Tt genotype in pea plants?

Back

The Tt genotype indicates that the plant is a hybrid for stem height, with one dominant allele (T) and one recessive allele (t).

Front

What trait did all F1 plants exhibit in Mendel's experiments?

Back

All F1 plants exhibited the dominant trait, which was tallness in the case of pea plants.

Front

What is the principle of segregation?

Back

The principle of segregation states that during the formation of gametes, the two alleles for a trait separate from each other.

Front

What is the principle of independent assortment?

Back

The principle of independent assortment states that alleles for different traits are distributed to gametes independently of one another.