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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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The rubella virus causes German measles. If a pregnant woman is is infected by the rubella virus during the first trimester of her pregnancy, her child may be born deaf or blind. Infections later in pregnancy do not increase the risk of these effects. Explain why.

Summary Introduction

Concept introduction: Rubella is an airborne virus that causes German measles. Pregnant women affected with Rubella have children that have congenital rubella syndrome (CRS).

To explain: Rubella infection of a pregnant woman in her first trimester results in a child with hearing and vision incapability, whereas during later stages of pregnancy, it does not increase the risk of these effects.

Explanation
During the first trimester most of the organ development occurs. The limbs are sculpted during the first trimester. Also, the sensory organs that include eyes and ears also develop. The brain development occurs during the same period. By the end of the first trimester, most of the major organs are developed. The virus takes up host translation machinery...

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