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Exam 3: Heredity and Environment

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Question 71

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Most of the known single-gene disorders are _____.

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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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Fraternal twins are also called _____ twins.

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

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?

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 _____.

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

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

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

Each human has a total of about _____ genes.

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.

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

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

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

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 "_____."

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

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

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

Each human body cell contains _____ chromosomes.