1. A plant having the genotype AaBbCcDdEe is self-fertilized. The dominant allel
ID: 272671 • Letter: 1
Question
1. A plant having the genotype AaBbCcDdEe is self-fertilized. The dominant alleles fo is shown as upper case (e.g. A). The likelihood of the progeny of this self-fertilizatio the same PHENOTYPE as the parent is calculated by: c. 34 x 34 x 34 x 34 x 34 d. 34+34+34+34+34 2. In Drosophila melanogaster, X-ray induced mutation resulted in flies with variegated e color. This was caused by all but one of the following. Choose the incorrect statement: a. facultative heterochromatin b. X-ray induced translocation c. genetic mutation of the w+ (red) gene to w (white) in some, but not all, eye pigment cells, of d. spreading of heterochromatin into the w+ locus in some, but not all, eye pigment cells of the 3. How does UV light induce the lytic cycle in bacteriophage A.? a. activates RecA protease, leading to cl cleavage b. degrades cll, decreasing cl expression c. stabilizes N, increasing anti-termination and inducing cro d. induces recombination between galK and bioA to excise the prophage 4. A tRNA anticodon is 5' GAA 3'. Which one of the following codons is recognized by this tRNA a. 5' CTT 3' b. 5, TTC 3' c. 5' UUC 3 d. 5' CUU 3Explanation / Answer
1. d. 3/4 x 3/4 x 3/4 x 3/4
Self pollination of heterozygous dominant results in 75% of dominant phenotype with 25% homozygous dominant, 50% heterozygous dominant and 25% homozygous recessive. So 3/4 of the total phenotype will be dominant. Since there are total 4 genes, the probability will be mutliped.
2. a. Facultative heterochromatin
3. a. Activates RecA protease, leading to cI cleavage.
4. c. 5' UUC 3'
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