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Exam 3: Heredity and Environment

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Question 51

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_____ are units of instructions for cells located on chromosomes.

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Question 52

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The mother's ovum determines whether the fetus will become a boy or a girl.

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Question 53

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Alice loves to share information that she has learned from school with her parents. She comes home one day and, at dinner, tells her family she has learned about cell differentiation in science class. The information she tells them is correct, so over dinner, she tells them that once cells differentiate, _____.

Individuals who may especially benefit from preconception, prenatal, or even prenuptial (before marriage) genetic counseling include all the following EXCEPT _____.

The _____ is an international effort to map the complete human genetic code.

List three unanticipated consequences of China's one-child policy. In which year did China rescind this policy?

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

The first 22 chromosomes contain hundreds of genes in the same positions and sequence. If the code of the gene from one parent is exactly like the code of the same gene from the other parent, the gene pair is heterozygous.

All living things are composed of cells, and the work of cells is done by _____.

_____ refers to a trait that is affected by many factors, both genetic and environmental, that enhance, halt, shape, or alter the expression of genes, resulting in a phenotype that may differ markedly from the genotype.

Most of the known single-gene disorders are _____.

The general term for the techniques designed to help an infertile couple conceive and then sustain a pregnancy is in vitro fertilization (IVF).

_____ can help prospective parents understand their genetic risk so that they can make informed decisions about conceiving a child.

A trait like personality is _____, or affected by many genes.

When a person inherits a recessive gene that is not expressed in the phenotype, he or she is a carrier of the gene.

_____ is when genes have different effects, depending on whether they come from the mother or the father.

_____ refers to all the microbes that live within every part of the body.

Genes with various repeats or deletions of base pairs are referred to as "_____."

James and Claire have been trying for several years to get pregnant but have not been successful. They understand the procedures required for in vitro fertilization, but they have not looked into the cost. If James and Claire were to move forward with IVF, they should expect to pay about _____ for all the drugs, the monitoring, and the procedure itself.

The _____ was a worldwide effort to map the complete human genetic code.