An Rh-positive baby can cause an Rh-negative mother to produce antibodies against the Rh antigen. When is this a problem?
What will be an ideal response?
This is a problem during a subsequent pregnancy, when the mother's anti-Rh antibodies cross the placenta and enter the blood of the fetus. If the second fetus is Rh-positive, the anti-Rh antibodies can destroy the fetal red blood cells, causing stillbirth or hemolytic disease of the newborn.
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Over-the-counter medications for acid reflux or heartburn block the production of stomach acid. Which of the following cells are directly affected by this medication?
A) goblet cells B) chief cells C) parietal cells D) smooth muscle cells
Which of the following correctly orders the sequence in which genes controlling the development of the anterior-posterior axis of Drosophila larvae are expressed?
A. maternal-effect genes, gap genes, pairrule genes, segment-polarity genes B. maternal-effect genes, gap genes, segment-polarity genes, pair-rule genes C. pair-rule genes, maternal-effect genes, segment-polarity genes, gap genes D. maternal-effect genes, segment-polarity genes, pair-rule genes, gap genes E. gap genes, pair-rule genes, segmentpolarity genes, maternal-effect genes
When alleles on a pair of homologous chromosomes move into different gametes during meiosis, this demonstrates
A) segregation. B) crossing over. C) dominance. D) recessive inheritance. E) fertilization.
Groups of tissues that function together form a(n)
A) system. B) individual. C) gland. D) organ. E) organ system.