The diagram shows the position of two chiamata (A and B) where crossing over may take place between a pair of homologous chromosomes during melosis. The position of 3 genes P, Q and Ris
shown on each chromosome.
P
P
P
Q
Q
99
R
R
a) state the gametes which would be formed in each of the following three cases. In the table below.
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3 marks
Crossing over oametes formed
events
1
None
2 Aouly
3 B only

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

What do nitrifying bacteria convert

The hematodinium parasite becomes less of a problem for the blue crab when the crab is very young. fishing is thriving in the region. the crab moves to less salty water. a significant percentage of the population is impacted.