Question 1

A sex-linked chromosomal disorder in females in which either an X chromosome is missing (XO)or part of one X chromosome is deleted.Females with this disorder are usually short in stature,have a webbed neck,and are often infertile.

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Question 2

A psychological perspective that emphasizes the importance of adaptation,reproduction,and "survival of the fittest" in shaping behavior.

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Question 3

The period of prenatal development that occurs 2 to 8 weeks after conception.During this time,the rate of cell differentiation intensifies,support systems for the cells form,and organs appear.

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Question 4

The observable characteristics of an individual's genetic makeup.

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Question 5

The prenatal period of development that begins 2 months after conception and lasts for 7 months.

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Question 6

The prenatal period of development that takes place in the first 2 weeks after conception.It includes the creation of the zygote,cell division,and the attachment of the zygote to the uterine wall.

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Question 7

Structures found in the nucleus of the cell that contain DNA.The human body contains 23 of these structures,arranged in pairs.

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Question 8

The interaction of many different genes to produce an inherited characteristic.

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Question 9

A sex-linked chromosomal disorder resulting from an abnormality in the X chromosome which often becomes constricted and may break.This disorder occurs more frequently in males than in females.A person with this disorder typically has some sort of mental deficiency such as mental retardation,a short attention span,or a learning disability.

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Question 10

A prenatal test designed to assess whether a fetus is developing normally.With this procedure,high-frequency sound waves are directed into the woman's abdomen.The echo from the sounds is transformed into a visual representation of the fetus's inner structures.

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Question 11

A genetic disorder in which the individual cannot effectively metabolize phenylalanine (an amino acid).If a child's diet is not modified to prevent an excess accumulation of the phenylalanine,this amino acid is stored,resulting in mental retardation and hyperactivity.

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Question 12

One of the three layers of cells of the embryo.This is the inner layer of cells that will develop into the digestive and respiratory systems.

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Question 13

A sex-linked chromosomal abnormality that is characterized by a male having an extra X chromosome (XXY).A man with this disorder typically has undeveloped testes and developed large breasts.

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Question 14

Short segments of DNA located on the chromosomes.These are considered to be the basic units of hereditary information.

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Question 15

A heredity-environment correlation where individuals seek out environments consistent with their genetic makeup.

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Question 16

A genetic disorder,occurring primarily in African Americans,in which the body's red blood cells take on a hook shape instead of the normal round shape.This abnormally shaped blood cell is unable to carry oxygen properly,so the affected individual usually develops anemia.

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Question 17

This is one of the life-support systems of the embryo.It contains two arteries and one vein connecting the baby to the placenta.

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Question 18

A chromosomal abnormality that is characterized by an extra copy of chromosome 21.A person with this disorder typically has a round face,a flattened skull,an extra fold of skin over the eyelids,a protruding tongue,short limbs,and retardation of motor and mental abilities.

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Question 19

A prenatal test designed to assess whether a fetus is developing normally.With this procedure,a sample of amniotic fluid is withdrawn by syringe and tested for chromosomal or metabolic disorders.

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