Heredity · Class 10 · CBSE Science
A pure breeding tall pea plant with round seeds (TTRR) is crossed with a pure breeding dwarf plant with wrinkled seeds (ttrr). What proportion of the…
Practice question from Heredity (Class 10 · CBSE Science), with the correct answer and a step-by-step solution.
hard · MCQ · Q-DAE6DA
A pure breeding tall pea plant with round seeds (TTRR) is crossed with a pure breeding dwarf plant with wrinkled seeds (ttrr). What proportion of the generation plants will exhibit the new combinations of traits (tall with wrinkled seeds, or dwarf with round seeds) according to Mendel's dihybrid cross?
- A.1/16
- B.3/16
- C.6/16Correct answer
- D.9/16
Solution
In a classic Mendelian dihybrid cross, the phenotypic ratio in the generation is 9:3:3:1. The parental combinations (tall/round and dwarf/wrinkled) account for 9/16 and 1/16 respectively (total 10/16). The remaining two recombinant categories are tall/wrinkled (3/16) and dwarf/round (3/16), which together make up 6/16 or 3/8 of the progeny.
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