sickle cell (2)
sickle cell (8)
cystic fibrosis (2)
tay-sachs (4)
Huntington's (2)
PKU (2)
Quiz, pp. 260 -- 266
1. If W is the symbol for the trait of a widow's peak, and the trait is due to a dominant allele, what do we know about the parents if at least one of their children does not have a widow's peak?
2. If we use F as the symbol for an attached earlobe, which is a recessive trait, which allele combination would someone have to have in order to display the phenotype of an attached earlobe?
3. Cystic fibrosis and many other medical conditions are genetic disorders inherited as r____________ traits.
4. If an offspring has a dangerous medical condition caused by recessive traits (that we'll symbolize with A), to simplify, the parents must be both either Aa (and not have the disease themselves) or aa (and have the disease themselves). Why?
5. In the case above with a serious medical condition like cystic fibrosis, the parents are likely to have a genotype of Aa. Why?
6. In the case above, why is a parent with an Aa genotype called carriers?
7. Why is Huntington's disease still passed on to children even if the parent has it and eventually dies from it? What is different about Huntington's that makes it able to pass to the next generation even though its allele is dominant?
8. Genetic screening can detect if a parent is a c__________, if a fetus has a genetic disorder, or if a newborn does.
9. Fetal screening can either be a____________, which tests the a_________ fluid; or CVS, which tests f______ cells. If a fetus is found to have a genetic disorder, parents can prepare for the situation or the mother can choose to a___________ the fetus.
10. Newborn screening, like the one that tests for P_____, is done after birth and the child is treated when possible. Mental retardation from PKU can be prevented with a special diet.
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