Exam 2: Heredity and Prenatal Development

Chromosomes contain thousands of segments called

Diabetes is a sex-linked abnormality.

Distinguish between monozygotic (MZ) twins and dizygotic (DZ) twins.

Twins that derive from a single zygote that has split into two are called _______.

Why is amniocentesis carried out on pregnant women?

The fetus begins to turn and respond to external stimulation at about the second or third week.

Tim, a 27-year-old man, has unusually narrow shoulders, low muscle mass, and has no facial and body hair. His doctor recently prescribed testosterone replacement therapy to him. Tim is most likely suffering from:

When the effects of both alleles are shown, there is said to be ______.

The chances that a woman will bear twins rises if:

Rico is a man who has enlarged breasts and suffers from mild intellectually disability. He has a problem learning languages, and his body produces less of the male sex hormone testosterone than normal males. Rico is most likely suffering from:

Which of the following statements is true of Down's syndrome?

Babies with fetal alcohol spectrum disorder (FASD) are often larger than normal, and so are their brains.

Which of the following statements describes the purpose of menstruation from the perspective of conception?

A blastocyst gains mass only when it receives nourishment from outside.

Discuss the types of teratogens.

When both alleles for a trait are different, the person is said to be _____.

After mitosis, the genetic code is identical in new cells unless radiation or other environmental influences cause _________ .

How do differences in genetics contribute to variations among individuals?

How does one draw conclusions from the results of twin studies?

Describe the symptoms and conditions of a child with Down's syndrome.