Heredity

In Mendel's cross for stem height, how did the plants in the F₂ generation differ from the F₁ plants?

• There was no difference in the F₂ plants.

• Some F₂ plants were short.

• All F₂ plants were short.

• All F₂ plants were tall.

Why is a pea plant that is a hybrid for stem height tall?

• The dominant allele for tall stems masks the recessive allele for short stems.

• The recessive allele for tall stems masks the dominant allele for short stems.

• The hybrid pea plant has two recessive alleles for tall stems.

• The hybrid pea plant has two dominant alleles for tall stems.

When parent plants are crossed, as what do scientists refer to the first generation of offspring?

• P

• F2

• 1F

• F1

Which of these describes a hybrid organism?

• An organism with only a few traits

• An organism that has genes from different species

• An organism that contains only one type of gene

• An organism with traits derived from one parent

Capital letters are used to represent recessive alleles.

• True

• False

Mendel called an individual that has one dominant allele and one recessive allele for a trait a purebred.

• True

• False

Mendel said that the factors that control a trait exist in pairs.

• True

• False

Mendel's experiments showed that the traits of an offspring were not a blend of the characteristics of the parents.

• True

• False

The alleles for a hybrid tall pea plant are represented as..

• Tt

• tt

• TT

• TS

A seed can be round or wrinkled. Seed shape is

• a trait

• an allele

• a factor

• a gene