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AGR 3303 (3 credits) University of Florida - Fort Lauderdale  |
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| Below is exam #2 Part B for 1993, Mendelian
genetics |
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AGR 3303 - Genetics 22 Nov 1993 University of Florida - Fort Lauderdale Exam #2 B: PARTICULATE GENETICS (10 pts.) Name ________________________________________
1. A plant breeder studied the inheritance of variegated leaves in Dieffenbachia maculata. (Variegated leaves in this foliage plant are important, because they are considered esthetically attractive.) The plant breeder postulated that leaf pattern (variegated versus all-green) was controlled by a single gene locus, with the variegated trait dominant to all-green. The variegated cultivar 'Hoffmannii' was believed to be heterozygous (Pvpv) because of the presence of both variegated (PvPv and Pvpv) and all-green (pvpv) progeny following self-fertilization (see table, below). The plant breeder compared the observed numbers in different progeny classes (variegated versus all-green) with the 3:1 ratio expected based on the postulates of Gregor Mendel. Comparison of the observed with the expected resulted in a very small chi-square value (0.15) which tabulated to a P (probability) value of approximately 0.80. The null hypothesis was, "the true ratio of selfed progeny is 3:1, variegated:all-green".
a. Would you accept or reject the null hypothesis? ___________________________ b. Why? Justify your answer in two ways: (i) statistical language, referring to probability; and (ii) layman's terms. (5 pts.)
Matching (5 pts.) In each of the following five blank spaces, insert the correct word or phrase from the following list: allopolyploid aneuploid haploid triploid trisomic 2. An organism with two or more diploid genomes from different species (e.g., bread wheat) is
__________________________________.
3. If you cross a tetraploid watermelon with a diploid, the progeny are sterile because they are
__________________________________.
4. The chromosome make-up of sperm and eggs is _______________________________.
5. Down syndrome is the only human autosomal _________________________________ in which a significant number of individuals survives longer than one year past birth.
6. If the chromosome number is not an exact multiple of the haploid set, the individual is considered to be ________________________________________. |
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