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Exam 11: The First Geneticist: Mendel and His Discoveries

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Question 1

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What is the basis for incomplete dominance?

A) Both alleles of a gene produce weakly functioning proteins.
B) One allele produces some functioning protein; the other allele is nonfunctional.
C) Crossing over has switched alleles for a gene on homologous chromosomes.
D) One gene has many effects.
E) An individual has more than two alleles for a gene.

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Question 2

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Crossing two pink snapdragons yields some seeds that produce red-flowering plants,some seeds that produce white-flowering plants and some seeds that produce pink-flowering plants.If this trait operates by incomplete dominance and the allele R represents red flowers and the allele r represents white flowers,what genotype would a plant with pink flowers have for this trait?

A) RR
B) Rr
C) rr
D) RrRr

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Question 3

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The D gene controls pea plant height.The DD and dd genotypes confer tall and dwarf phenotypes,respectively.What is the relationship between D and d?

A true-breeding strain of red tulips is crossed to a true-breeding strain of white tulips.All the offspring have pink flowers.When a pink-flowered plant is self-fertilized,the offspring have red,pink,and white flowers,in the ratio 1:2:1.This type of inheritance is an example of ________.

If a person has a recessive trait,the genotype must be homozygous recessive for the trait.

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.A true-breeding plant with green seeds and white flowers is crossed to a plant that is heterozygous for the genes for both phenotypes.What is the probability that the cross will yield a plant with green seeds and white flowers?

Which type of inheritance is most likely to display a bell curve of phenotypes?

Dimpled cheeks are dominant to undimpled cheeks.If there exists a 50 percent chance that a child will have dimpled cheeks,the parental genotypes must be:

When a yellow-seeded pea plant with the genotype Yy produces gametes,what will be the genotype(s) of the gametes?

What is the difference between a monohybrid and a dihybrid cross?

A man with type O blood has a sister with type AB blood.What are the genotypes and phenotypes of their parents?

Before Mendel,people had observed inheritance of dominant and recessive traits by following many generations of plants and animals.What was different about Mendel's work?

Mendel wanted to make sure his starting plants bred true,meaning the:

What is the term for an observable trait of an organism?

Cystic fibrosis (CF) is caused by a recessive allele.A child has CF,even though neither of his parents has CF.Which of the following describes the genotypes of the parents?

List two characteristics of the garden pea plant,Pisum sativum,that make it an ideal organism for genetic experiments.

A,B,and O blood type in humans is controlled by a single gene with three alleles: Iᴬ,Iᴮ,and i.Type O is the recessive trait.The i allele is recessive to both Iᴬ and Iᴮ.Which of the following could be possible genotypes of the parents of a person with type O blood?

The genotype Ff is an example of a:

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape,he saw a 9:3:3:1 ratio in the next generation.Explain what this ratio describes and what each number represents.

In the Law of ________,Mendel stated that two genetic elements are separated in gamete formation.