Answer:
The correct answer is keystone predator.
Explanation:
In sustaining the composition of an ecological community, a keystone species plays an essential function. In the absence of keystone species, the ecosystem would fail to exist and would become drastically different. A predator is a classic illustration of a predator, which inhibits a specific herbivorous species from eradicating the dominant species of plants. In the non-existence of predators, the herbivorous prey would increase enormously and would clean the entire essential plant species, and thus, drastically change the significance of the ecosystem.
Positive selection of t cells occur in .the thymus
Answer:
We need to cross a white eyed female (XwXw) and red eyed male (XRY).
The cross can be shown as:
Xw Xw
XR XRXw (female, red eyed) XRXw (female, red eyed)
Y XwY (male, white eyed) XwY (male, white eyed)
Thus, in the offspring we will have the following phenotype:
Males: White eyed.
Females: Red eyed.
Explanation:
Nondisjunction could occur during - Anaphase ii
<h3>
What is Nondisjunction ?</h3>
Nondisjunction occurs when the chromosomes do not separate. In this case, gametes are produced with an abnormal number of chromosomes. It is an abnormal number of chromosomes in all cells called aneuploidy or in some cells called mosaicism.
Example ; Down's syndrome, Trisomy of autosomes.
Anaphase is the 3rd stage of cell division process specially after the metaphase in mitosis. In this step sister chromatids gets seperated from each other and pulls towards the cell's ending portion.
specially in Anaphase 2 chromatids splits at the centromere and pulled to the spindle fibres.
To know more about the Anaphase please click here :
https://brainly.ph/question/33956?
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