Question 1

An allele is a variation that makes a gene different in some way from other genes for the same characteristic.

Accepted Answer

A) True 
 B)False

Question 2

About ___ percent of natural conceptions never implant.

Accepted Answer

A)  10 
B)  25 
C)  50 
D)  75

Question 3

Dizygotic twins have _____ of their genes in common.

Accepted Answer

A)  25 percent 
B)  50 percent 
C)  75 percent 
D)  100 percent

Question 4

During the germinal period,the first task of the zygote's outer cells is:

Accepted Answer

A)  differentiation. 
B)  duplication. 
C)  germination. 
D)  implantation.

Question 5

In the United States,which is NOT a potential reason for the rise in the frequency of low-birthweight babies?

Accepted Answer

A)  food insecurity 
B)  drug use 
C)  cigarette use 
D)  genetic factors

Question 6

A teratogen is any agent or condition that increases the risk for:

Accepted Answer

A)  prenatal abnormalities. 
B)  damage to the placenta. 
C)  extra chromosomes. 
D)  male infertility.

Question 7

Each variation of a gene is called a(n)_____.

Accepted Answer

The answer of Each variation of a gene is called...

Question 8

Women become drunk on _____ compared to men.

Accepted Answer

A)  more alcohol 
B)  less alcohol 
C)  the same amount of alcohol 
D)  more alcohol in the summer and less alcohol in the winter

Question 9

The instructions for making amino acids are on about 3 billion pairs of chemicals called "_____ pairs."

Accepted Answer

A)  couple 
B)  foundation 
C)  base 
D)  copy

Question 10

When a sperm and an ovum combine,they create a new single cell called a "_____."

Accepted Answer

The answer of When a sperm and an ovum combine,they...

Exam 2: The Beginning: From Conception to Birth

An allele is a variation that makes a gene different in some way from other genes for the same characteristic.