Albinism in most animals is an epistatic trait characterized by a lack of melanin pigment in the eyes, skin, and hair. If the allele for albinism is a, the allele for brown coat color is B, and the allele for red coat color is b, which of the following genotypes would result in an albino cow?
A. aaBB
B. aabb
C. Aabb
D. AaBb
E. aaBB and aabb
Answer: E
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A) the founder effect B) gene flow C) natural selection D) polyploidy E) disruptive selection
The work of Beadle and Tatum
1.showed that one gene seemed to affect one enzyme. 2.showed that protein was the genetic material. 3.showed that each gene seemed to affect several enzymes. 4.showed that DNA was the genetic material. 5.showed that each enzyme contained just one polypeptide.
The __________ fungi rely on extracellular digestion
and absorption of energy-rich substances from living organisms. a. chemosynthetic b. saprobic c. parasitic d. plasmodial e. autotrophic
A cell that lacks the ability to make DNA repair enzymes will
A) be unable to replicate its DNA. B) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. C) replicate its DNA as well as a cell with intact repair enzymes. D) be able to correctly replicate its DNA, but it will need more time to do so.