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BaLLatris [955]
1 year ago
8

What is the definition for Nonsense Mutation?

Biology
1 answer:
dalvyx [7]1 year ago
6 0

The Nonsense mutation, also called stop mutation, is a gene mutation that results in a change in the amino acid sequence that leads to a premature stop (G).

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Why can't more than one sperm enter an egg?
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<span>Only one sperm normally fuses with an egg because if more than one sperm fuses, through a process called polyspermy, development of the zygote usually stops.


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<span>Fertilization of one egg by two sperm is possible, but the resulting zygote is almost never viable because such a zygote would have three sets of chromosomes instead of the normal two. This condition, called triploidy, is usually incompatible with life. Those rare triploid infants that do survive to term have severe and multiple birth defects and rarely live more than a few days. </span>
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3 years ago
A cell under a microscope shows Two daughter cells were formed and they are haploid. Which stage of meiosis is the cell showing?
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The answer is <span>Meiosis I.</span>



<span>Meiosis is a cell division which results in the reduction of chromosome number by half - from diploid to haploid - in daughter cells. It consists of meiosis I and meiosis II. Meiosis I produces two haploid cells. Meiosis II is analogous to mitosis, so each of these two haploid cells will in meiosis II produce two haploid cells. In total, meiosis results in four haploid cells.</span>

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<span>Therefore, the production of two haploid daughter cells is in meiosis I.</span>

3 0
3 years ago
​ A polysome is ____. a. ​ the complex that adds a poly(A) tail onto an mRNA b. ​ an mRNA transcript to which multiple ribosomes
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Answer:b. ​ an mRNA transcript to which multiple ribosomes are attached

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Different ribosomes bind to the mRNA at different time elongating the polypeptide chain. We have the free( non-poly A ) and memberane bound (poly A) polysome.

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Read more: http://www.biologyreference.com/Co-Dn/Differentiation-in-Plants.html#ixzz54pAhWVdn
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