What is the relative biological fitness of an individual who is heterozygous for sickle-cell disease who lives in central Illinois vs. an individual who is heterozygous and lives in South Africa?
What will be an ideal response?
The relative biological fitness of the individual in central Illinois is lower than that of the individual living in South Africa. Being heterozygous for sickle-cell disease is only valuable if the individual lives in an environment that contains malaria.
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What would a scientist see when looking through a microscope at a piece of shoulder muscle?
A. striations with unbranched fibers B. striations with branched fibers C. no striations and unbranched fibers D. no striations and branched fibers E. The scientist would see none of the above features in shoulder muscle.
During which developmental stage is the human body plan set and organ formation occurs?
a. zygote b. blastocyst c. embryo d. fetus e. infant
Many identical copies of genes cloned in bacteria are produced as a result of _____
A) plasmid replication B) bacterial cell replication C) transformation D) plasmid and bacterial cell replication
If a daughter expresses an X-linked recessive gene, she probably inherited the trait from:
A) her mother. B) her grandmother. C) her father. D) neither parent. E) both parents.