Answer:
C
Explanation:
The F2 offspring of a cross would follow the ratio of 9:3:3:1 only if the cross is a <u>dihybrid for two unlinked traits</u>.
There is nothing like a monohybrid cross for two traits. A cross involving two traits is a dihybrid cross. Hence, options a and b are out of the equation.
A dihybrid cross for two closely linked traits would produce F2 offspring in another ratio that is different from 9:3:3:1 depending on the linkage map.
<em>Hence, the correct option is</em><em> C</em><em>.</em>
Explanation:
This much is undeniable. Based on the magnetic fingerprints locked into ancient rocks, we know that over the last 20 million years, magnetic north and south have flipped roughly every 200,000 to 300,000 years (this rate has not been constant over the planet's lifetime, though).
This could weaken Earth's protective magnetic field by up to 90% during a polar flip. Earth's magnetic field is what shields us from harmful space radiation which can damage cells, cause cancer, and fry electronic circuits and electrical grids.
Hi!
The two types of endoplasmic reticulum are:
Rough Endoplasmic Reticulum RER
Smooth Endoplasmic Reticulum SER
The major difference between the two is the presence of ribosomes. The membrane of rough endoplasmic reticulum is bound by ribosomes, whereas the smooth endoplasmic reticulum is not bound by ribosomes.
Another difference lies in their function. RER is a storage house for proteins and is where the proteins are manufactured whereas SER is known for storing lipids and proteins both.
<h3>Hope this helps</h3>
That field is called taxonomy (biology)
