Multiple ChoiceWhich of the following phenotypes is an example of polygenic inheritance?1847views6rank1comments
Multiple ChoiceHydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?2830views9rank
Multiple ChoiceA phenotype is controlled by gene A and gene B. Gene B controls the expression of gene A. This is an example of _____.1398views11rank
Multiple ChoiceTail length in a certain species of armadillo falls along a continuum; a plot of tail length versus frequency displays a normal distribution. Assuming that environmental factors do not play an important role in determining tail length, this type of variation probably reflects __________. 698views
Multiple ChoiceHeart disease, diabetes, cancer, alcoholism, and many mental illnesses can best be described as __________. 618views
Multiple ChoiceA single genetic locus that controls more than one trait is said to be __________. 696views
Multiple ChoiceIn people with sickle-cell disease, red blood cells break down, clump, and clog the blood vessels. The blood vessels and the broken cells accumulate in the spleen. These events lead to physical weakness, heart failure, joint pain, and brain damage. Such a suite of symptoms can be explained by __________. 2060views3rank
Textbook QuestionIs a round yellow pea seed (genotype RrYy) an example of polygenic inheritance? Why or why not490views
Textbook QuestionA quantitative trait . a. may be one that is strongly influenced by the environment; b. varies continuously in a population; c. may be influenced by many genes; d. is not either off or on; e. all of the above617views
Textbook QuestionWhen graphing the phenotypes of a trait controlled by many genes and the environment, the line showing the frequency of each phenotype resembles . a. a horizontal, straight line; b. a vertical, straight line; c. the letter T; d. a bell shape; e. a circle722views
Textbook QuestionSkin color in humans is at least partially hereditary; dark-skinned parents tend to have dark-skinned children. But humans come in a range of skin tones. Which extension of Mendel's model accounts for the hereditary variation in human skin color?533views
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