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Exam 3: Heredity and Environment

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Question 71

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A person's appearance, behavior, and brain and body functions combine to form the _____.

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Question 72

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Each variation of a gene is called a(n) _____.

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Question 73

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_____ disorders are more common because they are passed down from one generation to the next by carriers who are unaware of their genotypes.

Brown-eyed Alma has a blue-eyed mother and a brown-eyed father. In this case, her brown eyes were determined by a _____ allele.

Every human begins life as a single cell, which is called a _____.

Each human has a total of about _____ genes.

A small section of a chromosome that is the basic unit for the transmission of heredity is a _____.

Sally is born with 47 chromosomes instead of the usual 46. Sally's chances of survival are about 1 in _____.

After about the eight-cell stage within the zygote, cells start to _____, meaning that they take different forms and reproduce at various rates, depending on where they are located.

Which of the following is an example of a single-gene disorder that is dominant?

Timur and Juan are playing basketball. Timur shoots the ball, and Juan blocks the shot. Timur says, "Wow, I didn't realize how tall you were until you did that!" Timur's comment refers to Juan's "_____."

The process of methylation can do all the following to genetic instructions EXCEPT _____ them.

When the effects of genes combine to create the phenotype, they are called "_____ genes."

Fraternal twins are also called _____ twins.

Each human body cell contains _____ chromosomes.

The statistic that indicates how much of the variation in a particular trait can be traced to genes is called "_____."

Most of the known single-gene disorders are _____.

A fatal central nervous system disorder caused by a copy number variation-more than 35 repetitions of a particular set of three base pairs-is _____.

Older women are more likely to double-ovulate. As a result, they are more likely to have _____.

Identify three recessive conditions that are X-linked. Which condition results in cognitive deficits that are the most common forms of inherited intellectual disability?