Answer:
a) p=0.665
b) q=0.335
c) 2pq=0.445
d) (0.665^2)+(0.335^2)+(2*0.665*0.335)=1
Explanation:
For solve this exercise I will use the Hardy-Weinberg principle. We have the following:
a) and b)
number of purple flowers=142
number of white flowers=18
total number of flowers=160
frequency of white flowers=q^2=18/160=0.112
q=0.335
if
p+q=1
Clearing p:
p=1-0.335=0.665
c) the heterozygous is 2pq:
frequency of heterozygous allele: 2pq=2*0.665*0.335=0.445
d) p^2+2pq+q^2=1
(0.665^2)+(0.335^2)+(2*0.665*0.335)=1
Answer:
Fossil records provide evidence of an increase in animal species at the same time that atmospheric oxygen levels increased.
Explanation:
A huge diversification among animal species occurred with the increase in the levels of atmospheric oxygen. The reason why the number of species increased drastically was that a whole new world opened up, the land. The land was open for exploitation and taking over, with every single niche free, so animals diversified and filled in pretty much all of the niches. The fossil records give us clues when this happened, as from only microorganisms there is a sharp rise in complex animals, coinciding with the increase of oxygen levels.
If it wasn't for the increase of atmospheric oxygen though this wouldn't have been possible. The oxygen in the atmosphere enabled animals to breathe on land. Also, it cooled off the global temperatures which were too high before the increase of atmospheric oxygen, making them suitable for life. And last but not least, the atmospheric oxygen resulted in the formation of the ozone layer, a layer that started to act as protection from the UV rays.
This sexually transmitted disease is called chlamydia.
A "b." dam is a barrier that holds back water from a river.
