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ElenaW [278]
3 years ago
7

Which statement about the cell membrane is true?

Biology
2 answers:
xxTIMURxx [149]3 years ago
5 0
D. It prevents harmful substances from entering a cell.
Galina-37 [17]3 years ago
4 0

Answer:

D. It prevents harmful substances from entering the cell. I am very confident in this answer. The cell membrane is selectively permeable, and its job is to let certain things in and to keep certain things out.

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4 0
3 years ago
Two brothers have X‑linked red–green colorblind vision, and their parents have normal color vision. The first brother's karyotyp
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Answer:

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Explanation:

A nondisjunction in meiosis I produce all the aneuploid gametes, while nondisjunction at meiosis II produces 50 percent aneuploid gametes and the 50 percent normal gametes comprising haploid number of chromosomes.  

As it is mentioned that one of the brothers possess normal number of chromosomes (46), the mother encounters nondisjunction at meiosis II resulting in the formation of one n+1 gamete exhibiting two copies of X chromosome. Fertilization of this n+1 gamete with sperm results in the creation of zygote (47, XXY).  

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