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#dihybrid ratio

2 public questions tagged with this topic.

Aptitude and Reasoning

Which of the following is incorrect with respect to modification of Mendelian dihybrid ratio?

In aptitude and reasoning, quantitative reasoning dictates that ratio, percentage and series logic determine correct calculation. Therefore Additive gene interaction: 10:6 is correct as it meets mathematical and logical criteria, supported by mechanistic studies and conserved across related systems.

Ref: Wren and Martin, High School English Grammar and Composition, Revised Edition, Chapter 12, discusses vocabulary and comprehension providing guidance for verbal aptitude and logical inference assessment.

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Gene intraction

Recessive epistasis modifies the dihybrid ratio to

Recessive epistasis occurs when homozygous recessive genotype at epistatic locus aa masks expression of second locus, regardless of genotype at hypostatic locus. Phenotypically genotypes aaB- and aabb become indistinguishable because upstream block prevents downstream phenotype. Remaining segregating classes are 9 A-B- both dominant and 3 A-bb single dominant, plus combined 4 for masking class 3+1, producing ratio 9:3:4. Upstream gene may encode enzyme producing substrate required by downstream enzyme. Mouse albino cc preventing agouti and brown expression, and grain color maize are textbook i

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 6: Recessive Epistasis and 9:3:4 Ratio

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