Which of the following describes the ability of a single allele to have multiple

Question

Which of the following describes the ability of a single allele to have multiple phenotypic effects? A) incomplete dominance B) multiple alleles C) pleiotropy D) epistasis Which of the following is an example of polygenic inheritance? A) pink flowers in snapdragons B) the ABO blood group in humans C) white and purple flower color in peas D) skin pigmentation in humans A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative. Which of the following is a possible phenotype for the father? A) A negative B) O negative C) B positive D) AB negative When Thomas Hunt Morgan crossed his red-eyed F_1 generation flies to each other, the F_2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? A) The gene involved is on the Y chromosome. B) The gene involved is on the X chromosome. C) The gene involved is on an autosome, but only in males. D) Other male-specific factors influence eye color in flies. SRY is best described as _____. A) a gene present on the X chromosome that triggers female development B) an autosomal gene that is required for the expression of genes on the Y chromosome C) a gene region present on the Y chromosome that triggers male development D) an autosomal gene that is required for the expression of genes on the X chromosome A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color blind marries a color-blind male. What is the probability that this couple's first son will be color blind? A) 1/4 B) 1/2 C) 2/3 D) 3/4 A man who carries an allele of an X-linked gene will pass it on to ____. A) all of his daughters B) half of his daughters C) all of his sons D) all of his children What is the reason that closely linked genes are typically inherited together? A) They are located dose together on the same chromosome. B) The number of genes in a cell is greater than the number of chromosomes. C) Alleles are paired together during meiosis. D) Genes align that way during metaphase I of meiosis. In his transformation experiments, what did Griffith observe? A) Mixings heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form. B) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic. C) Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains. D) Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.

Explanation / Answer

Ans 38. Option C, Pleiotrophy

Sometimes, genetic changes and phenotype changes not from a mutation, but from a gene controlling multiple traits. This is called pleiotropy. As stated, pleiotropy is where one gene winds up controlling multiple phenotypic traits in the organism.

Ans 39. Option D, Skin pigmentation in human

Polygenic inheritance, also known as quantitative inheritance, refers to a single inherited phenotypic trait that is controlled by two or more different genes.In a system which differs from Mendelian Genetics, where monogenic traits are determined by the different alleles of a single gene, polygenetic traits may display a range of possible phenotypes, determined by a number of different genes and the interactions between them.

Ans 40. Option C, Bpositive

Ans 41. Option B, The gene involved is on the X chromosomes.

3.

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