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Lorico [155]
3 years ago
7

An organism has 12 chromosomes in its germinal cells. During spermatogenesis, which of the following cells is the first to have

6 chromosomes?
A. primary spermatoctes

B. secondary spermatocytes

C. spermatids
Biology
1 answer:
forsale [732]3 years ago
8 0
The answer is <span>B. secondary spermatocytes.

A diploid organism (2n) has 12 chromosomes (2n = 12) in its germinal cells. Spermatogenesis actually consists of mitosis and meiosis (the reduction division). It starts from spermatogonia (germinal cells) that are diploid. Through the mitosis, they divide into identical primary spermatocytes. As they are the result of mitosis, they are diploid (2n), too. However, primary spermatocytes undergo meiosis. After meiosis I secondary spermatocytes are formed and they are the first that are haploid (n) and have 6 chromosomes.
</span>
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The best answer for this would be:

 

​10-12 breaths per minute

 

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8 0
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3 0
3 years ago
A biology student caught and tagged 50 trout in a small lake. After two weeks, the student caught another 40 trout and found tha
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The low number of tagged trout recaptured may be because the tags slipped off.

This possibility can be reduced if the student used tags that does not slip off easily.

<h3>Mark and recapture method</h3>

The formula for calculating the estimated number of individuals in the population is given as:

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where:

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Calculating the estimate trout population:

N = (50*40)/4

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Therefore, the best estimate of the population of trout in the lake is 500 individuals.

The low number of tagged trout recaptured may be because the tags slipped off.

This possibility can be reduced if the student used tags that does not slip off easily.

Learn more about mark and recapture method at: brainly.com/question/10646744

6 0
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