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zheka24 [161]
3 years ago
11

"according to ackerman, exactly what causes leaves to change color? what particular conditions cause the brightest colors in aut

umn leaves?"
Biology
2 answers:
lorasvet [3.4K]3 years ago
6 0
When the trees prepare to face the winter the leaves stop making chlorophyll and the colors that were hidden from sight during the spring and summer came to live. The climate is responsible for the most intense colors. In years when the fall sunlight is strongest and the nights are cold and dry, the leaves show their most intense colors
Lady_Fox [76]3 years ago
4 0
<span>After the summer solstice, daylight gradually begins to shorten. Trees consider this and pull nutrients from their leaves back to their trunk and roots. This effectively chokes off any nourishment to the leaves and leaves them scarred and unable to produce chlorophyll. This scarring and lack of chlorophyll causes the leaves to change colors and eventually they will break down and fall off the tree.</span>
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"If the frequency of an allele in a population is 0.999, what is the expected frequency of homozygotes for this allele in a popu
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Answer:

The answer to the question is

The expected frequency of homozygotes for the allele in a population at Hardy-Weinberg Equilibrium is 0.998

Explanation:

From the question, we have the frequency of an allele  =  0.999

By Hardy-Weinberg Equilibrium

p² + 2pq + q² = 1 and p + q = 1

p = dominant allele frequency  in the population

q = recessive allele frequency  in the population

p² = homozygous dominant individuals  percentage

q² = homozygous recessive individuals  percentage

2pq = heterozygous individuals percentage

Therefore the frequency of the homozygotes for the allele = 0.999² =  0.998001 ≅ 0.998 to three decimal places

The Hardy-Weinberg equilibrium states that the genetic disparity in a population will remain unchanged from generation to generation in the absence of evolutionary disturbing influences

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