QUESTION 2
A true-breeding pea plant with smooth seeds is crossed with a true-breeding plant that has wrinkled seeds. If smooth seeds is the dominant factor, what will the offspring look like?

A. 100% wrinkled

B. 100% smooth

C. 50% smooth and 50% wrinkled

D. 75% smooth and 25% wrinkled

QUESTION 3

Which characteristic cannot be inherited?

A. the ability to win a soccer game

B. length of fur in dogs

C. shape of ears in pigs

D. height of stem in a sunflower plant

QUESTION 4

A true-breeding plant with yellow seeds is bred with a true-breeding plant with green seeds. What color seeds will the second generation produce where yellow is the dominant seed color?

A. all yellow

B. all green

C. three-fourths yellow and one-fourth green

D. three-fourths green and one-fourth yellow

QUESTION 5

Which statement correctly describes the mechanism of inheritance?

A. Alleles from heterozygous chromosomes determine traits.

B. Chromosomes on homozygous genes determine traits.

C. Alleles on homologous chromosomes determine traits.

D. Homologous chromosomes determine the genes for a trait.

QUESTION 6

Which statements correctly compare alleles and genes?

A. Alleles are alternative forms of instructions. Genes carry instructions to create proteins.

B. Alleles carry DNA instructions. Genes decode DNA instruction to make proteins.

C. Alleles are found on chromosomes. Genes are found in ribosomes.

D. Alleles contain sections of DNA code. Genes contain a single strand of DNA.

QUESTION 7

If both your mother and father have PKU disease, what is true?

A. You will not have the disease because the dominant trait is expressed.

B. Since PKU is a recessive disease, your chances of having it are 100%.

C. Since both parents are homozygous, your chances of having it are 50%.

D. There is a 75% chance that you will be a carrier of the disease, but you will not show symptoms.

QUESTION 8

In pea plants, smooth seeds (S) are dominant and wrinkled seeds (s) are recessive. In a cross between two heterozygous plants, what are the possible allele combinations and seed types of the offspring?

A. SS, smooth seeds

B. SS, smooth seeds or ss, wrinkled seeds

C. ss, wrinkled seeds

D. SS, smooth seeds; Ss, smooth seeds; or ss, wrinkled seeds

QUESTION 9

What did Mendel's cross-pollination of pea plants prove?

A. Certain factors are dominant, and other factors are recessive.

B. Crossing a tall plant with a tall plant will always result in a tall plant.

C. Inheritance of certain factors is dependent upon the genetic code.

D All the cells in an organism carry the same hereditary factors.

QUESTION 10

In tomato plants, Mendel found that the allele for smooth seeds (S) is dominant , while the allele for wrinkled seeds (s) is recessive. Which of these Punnett squares shows crosses between two plants heterozygous for smooth seeds?

S S
S SS SS
s Ss Ss

S s
s Ss ss
s Ss ss

S s
S SS Ss
s Ss ss

s s
s ss ss
s ss ss

QUESTION 11

Which two species are most closely related?

A. wolf and dog

B. dog and rabbit

C. human and dolphin

D. giraffe and horse

QUESTION 12

Both humans and dolphins are members of the class Mammalia. What is one example of an internal feature that is not similar to both?

A. skeletal system

B. lungs

C. respiratory system

D. digestive organs

QUESTION 13

What determines the similarities in anatomical features among organisms?

A. location on Earth

B. environmental conditions

C. predator-prey relationships

D. chromosomes and genes

QUESTION 14

What controls the cell's activities?

A. protein

B. DNA

C. allele

D. RNA