a) Suppose you have a plant with petals that are normally blue. Suddenly you see
ID: 6362 • Letter: A
Question
a) Suppose you have a plant with petals that are normally blue. Suddenly you see some white-petaled plants. You cross the white with the blue and you get all an F1 population that is all blue. In the F2 generation you see a ratio of 101:33 blue to white-petaled plants. What conclusion might you draw upon finding these results?b) Another line of flowers shows pink petals. You cross the pink with the blue and once again the F1 generation shows all plants with blue petals. However in the F2 generation the ratio is 192:63 blue to pink-petaled plants. Next, you cross the pink and the white. You get all blue in the F1 generation! In the F2 generation you see a segregation of 272:121:89, blue to white to pink-petaled plants. Explain the ratio you obtained in this cross. What can you deduce is going on here?
Explanation / Answer
In the F2 generation you see a ratio of 101:33 blue to white-petaled plants Blue -------101 White-----33 Total = 134 Blue color allele —B HOMOZYGOTE BLUE-----------BB HETEROZYGOTE BLUE --------------------Bb White------------------bb BB BLUE x bb White Bb BLUE Bb BLUE x Bb BLUE gametes B b B BB BLUE Bb BLUE b Bb BLUE bb White In the F2 generation you see a ratio of 101:33 blue to white-petaled plants It is 3:1 Basing upon above table, allele for blue petal is dominant, and allele for white petal is recessive in nature
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