Bio 187 Exam 2

Bio 187 Exam 2 - MWF V 1 NAME_ 1. A) B) C) D) E) 2. A) B)...

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MWF V 1 NAME_________________________ Page 1 of 11 1. Mendel concluded that each pea has two units for each character, and each gamete contains one unit. Mendel's “unit” is now referred to as a(n) A) character. B) transcription factor. C) chromosome. D) allele. E) None of the above 2. Mendel's crossing of true-breeding or pure-bred tall pea plants with short pea plants resulted in progeny that were all short. This indicates that the trait for height is A) codominant. B) dominant. C) recessive. D) Both a and b E) Both a and c 3. Which of the following is NOT needed for natural selection to occur in a population? A) Individuals must be able to move between populations. B) Variation must be genetically inherited. C) Certain variations allow an individual to produce more offspring that survive in the next generation. D) There must be variation in the phenotypes of individuals in the population. E) Actually, all of the above statements ARE needed for natural selection to occur in a population. 4. Scenario: Two different groups of crickets live in geographically separated locations and rarely interbreed (there is no selection occurring, either). On one occasion, a big-footed white cricket does mate with a small-footed brown cricket. Three offspring result: one big-footed brown cricket and two small-footed brown cricket If big feet (B) in crickets are dominant to small feet (b), the genotype of the big-footed white parent cricket with respect to the foot gene can A) only be Bb. B) either be bb or BB. C) either be bb and Bb. D) only be bb. E) only be BB.
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MWF V1 NAME______________ Page 2 of 11 5. Which of the following processes promote genetic variation? A) Independent Assortment. B) Crossing over. C) Frequency dependent selection. D) Subpopulations. E) All of the above. 6. The physical appearance of a character is called A) the phenotype. B) an allele. C) a feature. D) a gene. E) the genotype. 7. The pedigree below shows diseased individuals in black and “normal” individuals in white. Which description best fits this disease? A) Autosomal dominant. B) Autosomal recessive. C) Sex linked and dominant. D) Sex linked and dominant. E) None of the above. 8. It has been found that at a certain locus of the human genome, 400 different alleles exist in the population. Each person has at most _______ alleles for this trait. A) 200 B) 400 C) 1 D) 2 E) 100
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MWF V1 NAME______________ Page 3 of 11 9. The ABO blood groups in humans are determined by a multiple allelic system. If an infant born to a type ii mother also is type O, possible phenotypes for the father are A) O or A . B) A or B. C) O only. D) O, A or B. E) impossible to determine. 10. In the ABO blood type system, A) I A , I B and i are codominant. B)
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Bio 187 Exam 2 - MWF V 1 NAME_ 1. A) B) C) D) E) 2. A) B)...

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