Allozyme phenotypes of alcohol dehydrogenase in the flowering plant phox drummondii are determined by three co-dominant alleles of a single gene. in one sample of 70 plants the following data were obtained:

genotype a1a1 a2a2 a3a3 a1a2 a1a3 a2a3
number 4 24 10 10 2 20
what is the frequency of the a2 allele in this sample?

0.628

0.238

0.557

0.432

0.337

0.557

Explanation:

First calculate for the genetic frequencies

A1A1 = 4/70 = 0.057

A2A2 = 24/70 = 0.34

A3A3 = 10/70 = 0.14

A1A2 = 10/70 = 0.14

A1A3 = 2/70 = 0.029

A2A3 = 20/70 = 0.29

Frequency of A2 allele therefore = 0.34 + (0.5×0.14) + (0.5×0.29)

= 0.556

The difference in the answer is due to approximations.

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

d.

explanation: