One kind of plant has only blue flowers and white flowers. According to a genetic model, the offsprings of a certain cross have a 75% chance to be blue-flowering, and a 25% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 142 turns out to be blue-flowering. Are the data consistent with the model? Answer yes or no, and explain briefly.

Question

Biology

Alonzo Cantu

8 January, 13:38

One kind of plant has only blue flowers and white flowers. According to a genetic model, the offsprings of a certain cross have a 75% chance to be blue-flowering, and a 25% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 142 turns out to be blue-flowering. Are the data consistent with the model? Answer yes or no, and explain briefly.

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Answers (1)

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Alicia Gamble · Answer 1

Yes, the data is consistent with the model because the ratio of blue flowers with respect to white flowers is 3:1 which confirms the validity of the model.

Explanation:

It is clear from the given data that blue flower color is dominant over white flower color. Since the blue flowers are 75% and white flowers are 25% so the ratio of blue to white flowers will be 3:1 which is in accordance with Mendelian model of genetics.

When 200 seeds of such cross were raised, ~150 i. e. 142 plants had blue flowers while 200 - 142 = 58 which is ~ 50 plants had white flowers. So if we will find out ratio of blue to white flowers it will be 150:50 = 3:1 which is same as per the given genetic model.