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6 Cards in this Set
- Front
- Back
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What did Morgan discover when performing the trihybrid cross with all 3 x-linked traits (body color, eye color, wing length)? |
- much higher proportion of combo of traits found in P generation due to crossing over |
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Three criteria for successful mapping cross (trihybrid) |
1. Genotype of organism producing recombinant gametes must be heterozygous at all loci in question 2. Cross must be constructed so that genotypes can be deduced from phenotypes 3. A large number of offspring must be produced |
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If the 3 loci are unlinked, (1) how many types of gametes will be produced, (2) how many phenotypic classes will the F2 consist of, and (3) what will the frequency be? |
(1) 8 types of gametes (2^n=2^3) (2) 8 phenotypic classes (3) 1/8 each |
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If the 3 loci are completely linked, (1) how many types of gametes will be produced, (2) how many phenotypic classes will the F2 consist of, and (3) what will the frequency be? |
(1) 2 types of gametes (2) 2 phenotypic classes (3) 1/2 each |
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If the 3 loci are incompletely linked, (1) how many types of gametes will be produced, (2) how many phenotypic classes will the F2 consist of, and (3) what will the frequency be? |
(1) 8 types of gametes (2) 8 phenotypic classes (3) will vary depending on the distance between loci |
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Interference |
- cross overs in adjacent regions are not independent of one another - when a cross over event happens, it can alter the likelihood that a second cross over will occur in the same region - not equivalent or uniform |
