Teratogens are that can cause birth defects. a. dna fragments b. environmental agents c. recessive genes d. dominant genes

b. environmental agents is the correct answer.

Explanation:

Teratogens are the environmental agents that cause birth defects by its harmful effect on the embryo.

When the pregnant ladies may come in contact with teratogens during the pregnancy, which could result in a birth defect or abnormal development.

Teratogens are known to be the environmental agents which have the tendency of causing birth defects.

Further Explanation:

Any agent that has the ability to disturb the development of the fetus or the embryo  present in the environment is called teratogen. These may cause birth defects in the child or may even stop the pregnancy. There are different classes of this and these include chemicals, drugs, radiation, and maternal infections.

The study of the abnormal growth or development in fetus or embryo is called teratology. This causes congenital malformations or birth defects. Such abnormalities are found at birth and can be visible on the surface of the body.

Teratogen effect depends upon:

• Nature of teratogen.

• Duration of exposure.

• Genetic susceptibility of the mother.

• Heredity.

Teratogens affects morphogenesis,differentiation, and development of cells.There are many otheeer examples of chemical which affect the fetus like methyl mercury,lead, polychlorinated biphenyls.

Learn more:

1. Learn more about mitosis of cell cycle

2. Learn more about the menstrual cycle  

3. Learn more about meiosis of cell cycle

Answer Details:

Grade: High School

Subject: Biology

Chapter: Developmental Biology

Keywords:

Fetus, embryo, development, teratogen, teratology, environmental agents, birth, abnormalities, exposure, susceptibility,mercury, lead, polychlorinated biphenyl, heredity, differentiation, morphogenesis, methyl.

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