In rabbits, there are four alleles at the c locus. Arranged in dominance sequence they are:C
(agouti), cch (chinchilla), ch (Himalayan), and c (albino)
(a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan
offspring?
(b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
ANSWER: (a) no
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Compare and contrast the human pathogens and non-pathogens in Clostridium. Propose a reason for why this differentiation is challenging to assay in the laboratory (NOT on living eukaryotic animal models)
What will be an ideal response?
True or false: The inner cell mass of the blastocyst becomes the embryo, while the outer cell layer of the blastocyst forms part of the placenta
A. true B. false
Unlike single-celled organisms that have direct contact with their external environment, most cells in a multicellular
organisms do not have direct contract with their external environment. How do these cells acquire nutrients and eliminate wastes?
a. by active and passive transport between the basal lamina and the interstitial fluid b. by active and passive transport between the basal lamina and the plasma c. by active and passive transport between the intracellular fluid and the interstitial fluid d. by active and passive transport between the intracellular fluid and the plasma e. through gap junctions between the intracellular fluid and the plasma
According to the out-of-Africa hypothesis, when did Homo sapiens migrate to Europe and Asia?
A. 10,000 years before present B. 5 million years before present C. 1000 years before present D. 100,000 years before present E. 1 million years before present