Pretest

Question 1

Which describes the notation Tt for the trait of plant height?

Revolt · Accepted Answer

B: heterozygous phenotype; D: heterozygous genotype

Question 2

Which describes the mating of organisms that have different homozygous alleles for a single trait?

Revolt · Accepted Answer

A: monohybrid cross

Question 3

The offspring of a particular cross are 100 percent heterozygous for the trait of plant height. What were the most likely genotypes of the parents?

Revolt · Accepted Answer

D: TT times tt

Question 4

A plant can produce either purple flowers or white flowers. The purple flower color is dominant over the white flower color. What is the ratio of the offspring with purple flowers to the total number of offspring if two plants that are heterozygous for purple flowers are crossed?

Revolt · Accepted Answer

C: ratio of 3 to 4

Question 5

Which includes the physical characteristics of an organism?

Revolt · Accepted Answer

D: phenotype

Question 6

A dihybrid cross is created from plants that are heterozygous for both round seeds and yellow seed color. What is the ratio of offspring that have round seeds and yellow seed color?

Revolt · Accepted Answer

C: ratio of 9 to 16

Question 7

Mendel crossed two plants that were heterozygous for the trait of flower color. Which genotypes could he have used to represent the cross?

Revolt · Accepted Answer

B: Pp times Pp

Question 8

Which term describes an organism that has identical alleles for a trait?

Revolt · Accepted Answer

D: homozygous

Question 9

In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

Revolt · Accepted Answer

D: 100 percent

Question 10

In pea plants, tallness (T) is dominant to shortness (t). What are the predicted percentages of the genotypes of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?

Revolt · Accepted Answer

C: 50 percent Tt, 50 percent tt

Pretest Answers

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