Autosomal Dominant and Recessive Inheritance
Q: In an autosomal recessive pedigree, the trait often skips generations. True or False?
Did You Know?
A direct life cycle (or monoxenous cycle) is one in which the parasite is transmitted directly from one host to the next of the same species without requiring an intermediate host or vector. The entire development from the infective stage to the reproductive adult occurs within a single host species. Transmission is often via the fecal-oral route or direct contact. A classic protozoan example is Giardia lamblia. Cysts are passed in human feces and are immediately infectious to another human when ingested. An indirect life cycle (or heteroxenous cycle) requires one or more intermediate hosts or vectors to complete development. The parasite undergoes essential developmental stages in different host species. Transmission to the definitive host (where sexual reproduction occurs) usually involves predation or ingestion of the intermediate host. A protozoan example is Plasmodium falciparum (malaria). It requires both a human (intermediate host, for asexual replication) and a female Anopheles mosquito (definitive host and vector, for sexual reproduction) to complete its life cycle.
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