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PGS341 Ch.2 Question
| Question | Answer |
|---|---|
| The first 22 pairs of chromosomes are called _____ | Autosomes |
| _____ reflects the combined activity of a number of distinct genes | Phylogenetic inheritance |
| Individuals with _____ have an extra 21st chromosome, usually inherited from the mother | Down syndrome |
| When a fertilized egg has defective autosomes, the usual result is that _____ | The fertilized egg is aborted spontaneously |
| The term _____ refers to the fact that the same genotype can be associated with many different phenotypes | Reaction range |
| Nonshared environmental influences tend to make siblings _____ | Different from each other |
| The period of the zygote ends _____ | At 2 weeks after conception (when the zygote is completely implanted in the wall of the uterus) |
| Body structure and internal organs are created during the period of the _____. | Embryo |
| _____ is called the age of viability because this is when most body systems function well enough to support life. | Between 22 and 28 weeks |
| In the last few months of prenatal development, the fetus has regular periods of activity and _____, which are the first signs of fetal behavior. | The eyes and ears respond to stimulation |
| General risk factors in pregnancy include a woman's nutrition, _____, and her age. | Prolonged stress |
| _____ are some of the most dangerous teratogens because a pregnant woman is often unaware of their presence. | Environmental hazards |
| During the period of the zygote, exposure to a teratogen typically results in _____. | Spontaneous abortion of the fertilized egg |
| Two techniques to determine whether a fetus has a hereditary disorder are amniocentesis and _____ | Chorionic villus sampling |
| In the third stage of labor, the ____ is delivered. | Placenta |
| Two problems with using anesthesia during labor are that a woman can't use her abdominal muscles to help push the baby down the birth canal and ____ | The pain-relieving medication crosses the placenta and affects the baby |
| Home delivery is safe when a pregnant woman is healthy, has had a problem-free pregnancy, expects to have a problem-free delivery, and ____ | When trained health care professionals are present to deliver the baby |
| When the supply of oxygen to the fetus is disrupted because the umbilical cord is squeezed shut, _____ results | Hypoxia |
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