Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 42, Problem 1DAA
Summary Introduction
To explain: The most common type of birth defect in the single-birth group.
Concept introduction: During the gestation period, the mother can have single births or multiple births. A single birth is where only one fetus is carried during the gestation period in the womb. A multiple birth is where more than one fetus is carried during the gestation period such as twins, triplets, quadruplets, and so on. Carrying more than one fetus in the womb results in the insufficient supply of nutrients to the developing fetus. These fetuses become still-born or born with abnormalities.
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The graph in the right hand column shows the incidence of Down syndrome in the offspring of normal parents as the age of the mother increases. For women under the age of 30, how many infants with Down syndrome are born per 1,000 births? How many for women at age 40? At age 50? How many times more likely is a 50-year-old woman to give birth to a baby with Down syndrome than a 30-year-old woman?
Which of the following scenarios does NOT describe an event that leads to the conceptions of twins?
Select one:
A. two eggs are fertilized by two sperm cells, resulting in a fraternal twin.
B. High levels of FSH stimulate the maturation of three ovums.
C. Two eggs are fertilized by one sperm cell, resulting in a monozygotic twin.
D. One egg is fertilized by one sperm but divides into two zygotes, resulting in two babies of the same gender.
Which of the following statements regarding the formation of human twins is INCORRECT?
a. Nearly all identical twins form before the 9th day following fertilization.
b. Identical twins share an umbilical cord.
c. Fraternal twins form after two eggs become fertilized.
d. Identical twins form after two eggs become fertilized.
Chapter 42 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 42 - The end product of cleavage is a __________. a....Ch. 42 - The outermost germ layer in a vertebrate gastrula...Ch. 42 - Prob. 3SQCh. 42 - Match each term with the most suitable...Ch. 42 - In humans, fertilization typically occurs in the...Ch. 42 - The ________, a fluid-filled sac, surrounds and...Ch. 42 - Prob. 1DAACh. 42 - Prob. 2DAACh. 42 - Prob. 3DAACh. 42 - Birth Defects and Multiple Births A woman who...
Ch. 42 - The placenta consists of __________. a. embryonic...Ch. 42 - During the fetal period, ____________. a....Ch. 42 - Prob. 9SQCh. 42 - Match each hormone with its action(s). ______...Ch. 42 - Prob. 11SQCh. 42 - Prob. 12SQCh. 42 - Prob. 13SQCh. 42 - Prob. 14SQCh. 42 - Prob. 15SQCh. 42 - The rubella virus causes German measles. If a...Ch. 42 - Prob. 2CTCh. 42 - Prob. 3CT
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