LIFE SCIENCE CH 4 TEST (BJU)

Gregor Mendel used pea plants to study heredity for all of the following reasons except

• that it was relatively easy to cross different pea plants in order to observe the resulting offspring.

• that their characters, like pod color and height, were easy to observe.

• that the characters Mendel studied had at least two identifiable traits.

• that many characters such as pod color and seed shape were controlled by a dozen or more interacting genes.

When Mendel crossed purebred pea plants having green pods with purebred pea plants having yellow pods, the offspring were all

• purebred peas with green pods.

• purebred peas with yellow pods.

• hybrid peas with all green pods.

• hybrid peas with some green and some yellow pods.

A cross between purebred peas with inflated pods and purebred peas with pinched pods resulted in peas with all inflated pods. What is the recessive trait?

• hybrids

• inflated pods

• pinched pods

• pod shape

Which of the following is not one of Mendel’s three principles of heredity?

• In a cross of purebred parents, all offspring will show the dominant trait.

• In a cross of hybrid parents, all offspring will also be hybrid.

• Two alleles for a parent’s gene separate and then each combines with an allele from the other parent to determine the offspring’s trait.

• Each allele is passed to the offspring independently of the other alleles.

Alleles for a dominate trait are represented with _______ letters.

• uppercase
• lowercase
• Greek
• underlined

Which of the following is a phenotype?

• Bb

• black fur

• a pea plant

• a Punnett square

A Tt plant is crossed with a tt plant. What genotype(s) would you expect the offspring to have?

• all Tt

• all tt

• some Tt and some tt

• some TT, some Tt, and some tt

If a father is purebred for the dominant trait of dimples (DD) and a mother is purebred for not having dimples (dd), then you should expect the couple’s children

• to all be DD.

• to all be Dd.

• to be either DD or Dd.

• to be either DD, Dd, or dd.

Which of the following is an example of codominance?

• pink snapdragon flower color

• crossing a tall plant and a short plant to produce a medium plant

• crossing a pea plant with round seeds and a pea plant with wrinkled seeds to produce a pea plant with round seeds

• crossing a white horse and a black horse to produce a horse with both black hairs and white hairs

Which of the following is an example of multiple alleles?

• Depending on the interaction of two genes, Labrador retrievers can be black, brown, or yellow.

• The gene that controls fur color in rabbits has four different alleles.

• Human eye color is controlled by up to sixteen different genes.

• A red bull crossed with a white cow produces a roan calf.