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Which condition listed one of the most common causes of mental retardation and most common preventable cause of birth defects in the United States?
Congenital hypothyroidism (CH) is the one of the most common preventable cause of mental retardation.
Which of the following are major potential teratogens that affect embryonic development?
Common teratogens include some medications, recreational drugs, tobacco products, chemicals, alcohol, certain infections, and in some cases, uncontrolled health problems in the birthing parent. Alcohol is a well-known teratogen that can cause harmful effects on the fetus after exposure at any time during pregnancy.
Which of the following is a permanent change in an allele?
Mutations are any permanent changes to the sequence of bases in an individual’s genome. Mutations are the source of new alleles (and thus ultimately the source of all variation). This means that they can introduce new alleles into a population.
Which of the following is the part of the blastocyst that promotes implantation and produces hCG?
120 Cards in this Set
| 1. Fertilization normally occurs within which structure? | b) Fallopian tube |
|---|---|
| 4. This is the part of the blastocyst that promotes implantation and produces hCG. | c) Trophoblast |
| 5. This is the portion of the endometrium that lies between the embryo and the stratum basalis. | a) Decidua basalis |
What are teratogens and examples?
Teratogens are substances that may produce physical or functional defects in the human embryo or fetus after the pregnant woman is exposed to the substance. Alcohol and cocaine are examples of such substances.
Which of the following is an example of a teratogen quizlet?
Examples of Teratogens: These include pollutants, malnutrition, and stress.
What is an example of incomplete dominance?
Incomplete dominance occurs when neither trait is truly dominant over the other. This means that both traits can be expressed in the same regions, resulting a blending of two phenotypes. If a white and black dog produce a gray offspring, this is an example of incomplete dominance.
Which of these conditions should completely prevent the occurrence of natural selection in a population over time?
In Darwin’s thinking, the more closely related two different organisms are, the… More recently they shared a common ancestor. Which of these conditions should completely prevent the occurrence of natural selection in a population over time? All variation between individuals is due only to environmental factors.
What are examples of congenital defects?
Some common congenital disorders are:
- cleft lip and cleft palate — usually diagnosed during routine scans in pregnancy.
- congenital heart disease — including a hole in the heart, a valve problem or a problem with the blood vessels.
- cerebral palsy — usually diagnosed in the first few years of life.
What are birth defects examples?
What Types of Birth Defects Are There?
- heart problems such as hypoplastic left heart syndrome, transposition of the great arteries, and tetralogy of Fallot.
- spina bifida.
- orofacial cleft.
- clubfoot.
- Down syndrome.
- hemophilia.
- congenital dislocated hip.
- Tay-Sachs disease.
What is congenital condition?
A congenital disorder is a condition that is present from birth. Congenital disorders can be inherited or caused by environmental factors. Their impact on a child’s health and development isn’t always severe, and sometimes it can be quite mild.
What is a teratogen quizlet?
Teratogen. Any agent or stubstanch which can cause developmental abnormalities in the embryo or fetus.
What is meant by teratogen?
A teratogen is any agent that causes an abnormality following fetal exposure during pregnancy. Teratogens are usually discovered after an increased prevalence of a particular birth defect. For example, in the early 1960’s, a drug known as thalidomide was used to treat morning sickness.