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WorksheetsProbability of Inheritance
Total questions: 17
Worksheet time: 9mins
Which describes the notation Tt for the trait of plant height?
homozygous genotype
heterozygous genotype
homozygous phenotype
heterozygous phenotype
Which term describes an organism that has identical alleles for a trait?
homozygous
heterozygous
dominant
recessive
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?
Tt x tt
Tt x Tt
tt x tt
TT x tt
Mendel crossed two plants that were heterozygous for the trait of flower color. Which genotypes could he have used to represent the cross?
PP x PP
Pp x Pp
pp x pp
Pp x PP
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?
25 percent Tt, 75 percent tt
25 percent tall, 75 percent short
50 percent Tt, 50 percent tt
50 percent tall, 50 percent short
Which describes the mating of organisms that have different homozygous alleles for a single trait?
monohybrid cross
dihybrid cross
homozygous cross
heterozygous cross
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?
1:16
3:16
9:16
16:16
Which includes the physical characteristics of an organism?
gene
allele
genotype
phenotype
The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h).
Based on the Punnett square, what is the phenotype of the offspring?
Hh
HH
tall
short
A plant can produce either purple flowers or white flowers. What is the probability of purple-flowered offspring if two plants that are heterozygous for purple flowers are crossed?
1:4
2:4
3:4
4:4
The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. The Punnett square below examines the chance of offspring having freckles, which is a dominant trait.
Based on the Punnett square, what is the probability that the offspring will have freckles?
25%
50%
75%
100%
There are two different alleles for flower color, P and p. The image shows a white sweet pea that is labeled with its two alleles for petal color.
What can you surmise from the labeled image?
The genotype is heterozygous.
White petal color is a recessive trait.
White petal color is a dominant trait.
The phenotype is heterozygous.
There are two different alleles for flower color, P and p. The image shows a purple sweet pea that is labeled with its two alleles for petal color.
Which is the genotype of the sweet pea?
heterozygous dominant
heterozygous recessive
homozygous dominant
homozygous recessive
Why did Gregor Mendel choose to use purebred plants in his experiments?
They reproduce sexually.
They exhibit only one form of a trait.
They have a variety of traits.
They reproduce asexually.
What is one of the reasons why Gregor Mendel chose to study pea plants?
They exhibit only a single trait.
They produce flowers.
They grow very slowly.
They reproduce sexually.
Gregor Mendel crossed homozygous tall plants (TT) with homozygous short plants (tt). All the resulting offspring were tall. From these results, what conclusion did Mendel draw?
Tallness is a dominant trait.
The word homozygous always means dominant.
Only dominant alleles are passed on to offspring.
The alleles of the offspring were recessive.
Purple flowers are dominant over white flowers. A heterozygous purple flower is crossed with another heterozygous purple flower. What will the ratio of purple to white be?
3:1
1:3
2:2
4:0
