Question

BIO EXPERTS! HELP!HARDY WEINBERG...... In a population of a plant species, 225 plants are tall, while 26 are short. The height of the plant is controlled by a single gene, and only two alleles are present in this population:T (tall) and t (short), with t being recessive to T. The table below shows the number of short and tall plants over the next several generations:

Answer 1

Generation | Tall Plants (T) | Short Plants (t)
|_____1____|______225_____|____26_____|
|_____2____|______275_____|____28_____|
|_____3____|______233_____|____23_____|
|_____4____|______281_____|____21_____|
|_____5____|______295_____|____18_____|

Answer 2

1. Using the Hardy-Weinberg equation, is evolution occurring in this population? Explain your answer.
2. Describe how an increase in competition for sunlight would affect the frequency of T and t over time.

Answer 3

Are the allele and genotype ratios remaining relatively constant?

Answer 4

relatively yes. there is no increasing or decreasing. right?

Answer 5

i think.. maybe im wrong

Answer 6

Look at the ratios.

Generation | Tall Plants (T) | Short Plants (t)
|_____1____|______225_____|____26_____| 225/26 = 8.65
|_____2____|______275_____|____28_____| 275/28 = 9.82
|_____3____|______233_____|____23_____| 233/23 = 10.13
|_____4____|______281_____|____21_____| 281/21 = 13.38
|_____5____|______295_____|____18_____| 295/18 = 16.39

H/W tells us that there should be no significant trend, UNLESS there are evolutionary forces at play.

Answer 7

so is there evolution occuring??

Answer 8

That is the assumption of the theory, based on the ratio trend. Of course, finding the actual influence might be a bit trickier. To DOUBLE in only five years is shocking. We should be able to find that source.

Answer 9

Important: If we find some cause, particularly man-made, fixing it should restore equilibrium in very few generations - maybe only one!