Exam 2: Genetics and Prenatal Development

A fellow worker was present at his son's birth.He was really upset because his son was born with a white substance all over his skin and no one told him what the problem was.You should tell him ____.

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Question 1

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Explain the phenomenon of incomplete dominance in sickle cell inheritance.

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Question 2

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Incomplete dominance occurs when there is a dominant-recessive pair of genes and the phenotype is affected mostly by the dominant gene,but the recessive gene also becomes expressed partially.In sickle cell anemia,a person inherits two recessive genes for the sickle-cell trait and their blood cells are disk-shaped rather than round,causing clogging and a number of problems,such as pain.If the person only inherits one recessive gene for the sickle cell trait,they will not have sickle cell anemia,but some of their blood cells will be misshaped.This condition causes resistance to malaria,an often fatal disease that is common in Africa.It would be adaptive to carry this recessive trait in Africa,so this explains the higher prevalence of sickle-cell diseases among people of African heritage.

An infant born with facial deformities,heart problems,misshapen limbs,and a variety of cognitive problems,such as mental retardation,has characteristics of which of the following?

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Question 3

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Prenatal health depends on proper prenatal nutrition.Because approximately 50% of the world's population is rural,pregnant women _____.

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Question 4

What sexually transmitted infection is caused by the human immunodeficiency virus?

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Question 5

Which of the following have a 40 to 60% similarity of genetic inheritance?

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Question 6

Prenatal development is divided into segments.What are these segments called?

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Question 7

Explain how prenatal health can depend on whether the child was conceived in places where diet varies greatly,depending upon which foods are available at different times of the year.

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Question 8

When does implantation of the blastocyst occur?

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Question 9

In vitro fertilization,or IVF,has improved in recent years.What is the current rate of success of IVF in women under 35?

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Question 10

What are the first 2 weeks after fertilization referred to as?

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Question 11

What is the name of the downy hair that covers the fetus?

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Question 12

At the end of the eighth week,the embryo is only one inch long and weighs just one gram.According to the text,what can the embryo now do?

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Question 13

For in vitro fertilization,or IVF,what is the current rate of success of IVF in women aged 38-40?

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Question 14

Lamar and Chandra recently got married and have been discussing how long they could wait to have children.Based upon the text,at what age,statistically speaking,will Chandra run out of fertile ova?

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Question 15

When concordance rates are higher among monozygotic twins than dizygotic twins,this indicates which of the following?

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Question 16

Children born with chromosomal problems are almost always born to parents with ____.

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Question 17

What type of study allows researchers to study whether certain behaviors or traits are more closely related to their genetics or their environment?

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Question 18

Which test can be done earlier: amniocentesis or chorionic villus sampling (CVS)? Explain each.

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Question 19

How old are the ova of a 42 year-old woman trying to conceive?

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Question 20

Showing 1 - 20 of 301

A fellow worker was present at his son's birth.He was really upset because his son was born with a white substance all over his skin and no one told him what the problem was.You should tell him ____.

Explain the phenomenon of incomplete dominance in sickle cell inheritance.

An infant born with facial deformities,heart problems,misshapen limbs,and a variety of cognitive problems,such as mental retardation,has characteristics of which of the following?

Prenatal health depends on proper prenatal nutrition.Because approximately 50% of the world's population is rural,pregnant women _____.

What sexually transmitted infection is caused by the human immunodeficiency virus?

Which of the following have a 40 to 60% similarity of genetic inheritance?

Prenatal development is divided into segments.What are these segments called?

Explain how prenatal health can depend on whether the child was conceived in places where diet varies greatly,depending upon which foods are available at different times of the year.

When does implantation of the blastocyst occur?

In vitro fertilization,or IVF,has improved in recent years.What is the current rate of success of IVF in women under 35?

What are the first 2 weeks after fertilization referred to as?

What is the name of the downy hair that covers the fetus?

At the end of the eighth week,the embryo is only one inch long and weighs just one gram.According to the text,what can the embryo now do?

For in vitro fertilization,or IVF,what is the current rate of success of IVF in women aged 38-40?

Lamar and Chandra recently got married and have been discussing how long they could wait to have children.Based upon the text,at what age,statistically speaking,will Chandra run out of fertile ova?

When concordance rates are higher among monozygotic twins than dizygotic twins,this indicates which of the following?

Children born with chromosomal problems are almost always born to parents with ____.

What type of study allows researchers to study whether certain behaviors or traits are more closely related to their genetics or their environment?

Which test can be done earlier: amniocentesis or chorionic villus sampling (CVS)? Explain each.

How old are the ova of a 42 year-old woman trying to conceive?

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