Answer:
Explanation:
Most bacteria will die at first when an antibiotic is administered. But few bacterial cells will live. Those cells that live will reproduce and give that trait that is resistant against the antibiotic to their "kids." Therefore, the next generation of bacteria will be resistant to the antibiotic and the antibiotic will not be able to kill the bacteria infection. So in this case, natural selection was able to kill off the bacteria that wasn't resistant to the antibiotic and only the "fittest" survived
Answer:
Option D, TT
Explanation:
As per the given situation, the cross on tall plant will give only tall offspring.
Let us take the cases one by one
a) Tt or tt
Here genotype "tt" does not represent a tall pea plant and hence, this option is incorrect
b) Tt
This genotype will produce heterogyzous tall pea plant but when the cross will be done between two pea plants having genotype "Tt" , 50% of the offsprings will have "tt" genotype, thus they will not be tall. Hence this option is incorrect
c) tt
This genotype represent short pea plant, hence this option is incorrect
d) TT
This genotype represent homozygous tall pea plant and when a cross is carried out between two homozygous tall pea plants, all the offspring plant will be tall with genotype "TT". Hence, this option is correct.
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Circumstance <span>that cause an increase in Blood Pressure:
</span>
- increasing levels of aldosterone ((influences the reabsorption of sodium and excretion of potassium in the
kidneys. This will indirectly influence the blood pressure since the
volume of blood will change)
<span>- vasoconstriction ( blood vessels increase their contraction, which equals to more pressure)
</span>
-increased release of renin (Converts angiotensinogen, secreted in the liver, into angiotensin I).
- increased activity of Angiotensin-converting enzyme ( this enzyme converts angiotensin I into angiotensin II increasing vasoconstriction).
Circumstances that cause<span> a Decrease in Blood Pressure:
</span>
<span>- decreased sodium reabsorption ( by decreasing sodium, the amount of water will also decrease or , in other words,will be excreted. Less water, will decrease volume of blood and that means less blood pressure)
</span>
- vasodilation (The smooth muscle in the <span>blood vessels decrease their contraction, which equals to less pressure)
</span>
- declining levels of ADH(ADH <span>is produced in the hypothalamus and stimulates
vasoconstriction plus it promotes water reabsorption in the kidneys. To reduce blood pressure, is important to have ADH levels reduced)</span>
The process is called Cytokineses.