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DanielleElmas [232]
4 years ago
11

Which of the following is true of red blood cells? A. They live for only 120 days. B. They have multiple Nuclei. C. They live fo

r only about 20 days. D. Once created in bone marrow, they circulate for our lifetime.
Biology
2 answers:
zysi [14]4 years ago
8 0
Correct answer is (D. Once created in bone marrow, they circulate for our lifetime)
stealth61 [152]4 years ago
4 0

A. They live for only 120 days is correct. They are created in the bone marrow and destroyed in the spleen "red blood cells graveyard"

B. They have multiple Nuclei. Red blood cells don't have a nucleus but some can present structures called Jolly's bodies that are small pieces of the nucleus that they lost in the differentiation process

C. They only live for only about 20 days. No, red blood cells live for about 120 days

D. Once created in bone marrow, they circulate for our lifetime. Again, they have a limited lifetime

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Let us assign B for brown eyes, b for blue eyes; H for right-handed, h for left-handed. 
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BH    BbHh    BbHh    BbHh      BbHh  
Bh     Bbhh    Bbhh     Bbhh      Bbhh
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Now based on that you can see that there are 4 possible genotypic combinations which would express different phenotypic combinations as well. 

BbHh: Brown-eyed, right-handed
Bbhh: Brown-eyed, left-handed
bbHh:  Blue-eyed, right handed
bbhh:   Blue-eyed, left-handed

So again, there would be 4 possible phenotypes. 
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     (b) is right Answer.

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This is the answer of your question.☺☺

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