In pea, the purple vs. pink flower trait is controlled by one gene. After a pure
ID: 94635 • Letter: I
Question
In pea, the purple vs. pink flower trait is controlled by one gene. After a pure purple-flowered plant was crossed to a pure pink-flowered plant, the F1 plants all have purple flowers. One F1 was selected for self-crossing. The resulting F2 generation exhibits a segregation of 90 purple-flowered and 10 pink-flowered plants. Genotypic determination of those purple-flowered plants revealed that 14 of 90 purple-flowered plants carry the pink-flower allele rather than the purple-flower allele, while the rest of 90 plants contain the purple-flower allele and the 10 pink-flowered plants all carry the pink-flower allele. How would you explain this phenomenon?Explanation / Answer
Answer:
Baased on the information given in the question, purple color is dominant over pink color.
Purple: PP or Pp
Pink: pp
PP(purple) x pp (Pink)----------Parents
Pp (purple)--------------F1
Pp x Pp
Out of 90 puple-flowered plants, 14 plants are heterozygous (Pp) purple and remaining 76 plants are homozygous (PP) purple-flowered plants.
10 pink-flowered plants are homozygous (pp) for pink color
P p P PP(Purple) Pp(Purple) p Pp(Purple) pp(Pink)