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Exam 3: Transmission of Genes From Generation to Generation

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Question 21

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The separation of members of a gene pair into the gametes is called ____________________.

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Question 22

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Why did Mendel choose pea plants to experiment on?

A) Offspring of pea plants are fertile.
B) They have a number of different distinct traits.
C) They are self-fertilizing.
D) They have a relatively short life cycle.
E) All of theses are reasons Mendel chose pea plants to experiment on.

F) None of the above
G) B) and D)

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Question 23

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Given the existence of incomplete dominance and codominance, what does it really mean when it is said that a trait is dominant?

A pea plant with yellow peas is crossed with a pea plant that has green peas. The offspring include both yellow-pea and green-pea plants. The original plant with yellow peas must, therefore, have what genotype?

The inheritance of human traits is predictable because the genes controlling them exhibit the principles of both ____________________ and ____________________.

One of Mendel's major contributions to the study of heredity was the application of ____________________ in analyzing results of crosses.

What are the evolutionary advantages (if any) of segregation and independent assortment?

Free earlobes are dominant to attached ear lobes and brown eyes are dominant to blue eyes. Ricardo has brown eyes and attached ear lobes. Ricardo's mother has blue eyes and free ear lobes. Ricardo's partner, Shanteel, has blue eyes and free ear lobes. Shanteel's mother has brown eyes and attached ear lobes. What is the probability that Ricardo and Shanteel will have a child who has blue eyes and attached ear lobes?

Two parents with type A blood have a child who is type O. The parents' genotypes must be ____________________ and ____________________ or they must have the ____________ phenotype.

Chi square tests are used to determine whether a cross has been correctly constructed and analyzed.

A man has the aa phenotype that causes albinism. As such, he does not express his PP genotype, which would have made his eyes brown. The relationship between these two genes is an example of ____________________.

The proband in a pedigree is always heterozygous.

Recessive traits are expressed only in the homozygous state.

Originally, many geneticists thought that dominant traits were caused by the presence of a gene and a recessive trait by the absence of the gene. Evaluate this idea, giving evidence for and against this proposal.

In a situation with codominant inheritance _____.

In humans, hair texture is an incompletely dominant trait. Curly is the dominant genotype, wavy is heterozygous, and straight hair is recessive. What is the probable phenotypic ratio for a cross between a man with wavy hair and a woman with curly hair?

Pedigree analysis is a reconstruction of a family history.

Joshua has O type blood and the Bombay phenotype. His partner, Alice, has AB blood and does not have the Bombay phenotype, but her mother does. What are the possible blood types of the children of Joshua and Alice?

Methylmalonic acidemia is caused by _____.

In pedigrees, a male individual is symbolized as a ____________________.