Which of the following statements about human genetic disorders is false?
a. Individuals who are heterozygous for sickle cell disease are resistant to malaria.
b. Most genetic disorders are rare because they are either fatal at an early age or result in sterility
c. Non disjunctions are chromosomal disorders that result in individuals with extra or missing chromosomes
d. Carriers of recessive genetic disorders are phenotypically normal because the recessive allele is not expressed
e. Pedigrees of related individuals can be used to help determine if a trait is autosomal or sex-linked
Answer: d. Carriers of recessive genetic disorders are phenotypically normal because the recessive allele is not expressed
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Answer the following statement true (T) or false (F)
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A. Hfr B. F+ C. Conjugative plasmid
Parallel venation is to netted venation as:
a. nonvascular is to vascular. b. monocot is to eudicot. c. gymnosperm is to angiosperm. d. eudicot is to monocot. e. seed plants is to nonseed plant
The gastrointestinal tract does not include the ________.
A. stomach B. esophagus C. mouth D. larynx E. small intestine