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Butoxors [25]
3 years ago
11

Dog gametes contain 33 chromosomes. What is the genetic content of a dog body cell?

Biology
1 answer:
aleksandrvk [35]3 years ago
7 0

Answer:

If a dog's gametes have 33 chromosomes, the somatic or body cells have a genetic content of 66 chromosomes.

Explanation:

Gametes are the sex cells of sexually-reproducing organisms, with the characteristic of being haploid, that is, their<u> genetic content is reduced by half</u>. Unlike gametes, somatic or <u>body cells</u><u> contain the complete charge of chromosomes</u>, so they are called diploids.

If the genetic content of a dog's gamete is 33 chromosomes, its body cells must have twice as many, which means 66 chromosomes.

<em>     </em><em><u>An additional note</u></em><em>: a dog really has 78 chromosomes, so its gametes have 39 chromosomes. </em>

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All of the following are true of spermatogenesis EXCEPT: Question 18 options: DNA replicates once, but cells divide twice. The p
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Answer:

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Explanation:

Germ cells are diploid reproductive cells in charge of gamete production. Germ cells divide by mitosis and meiosis. Through mitosis, they originate more sexual cells, but through meiosis, they produce gametes -sperm and egg cells-. This process is known as gametogenesis.

Gametes´destiny is to merge during fecundation, and a new diploid cell called zygote emerges through fertilization. The zygote is a complete cell and suffers successive mitosis to form the new organism.

Spermatogenesis is the process of production and maturation of sperm cells. Spermatogonia are the masculine diploid germ cells, carrying 46 chromosomes. These germ cells suffer mitosis to reproduce. Some of them stay as spermatogonia, and some others become primary spermatocytes, which are in charge of gamete production. Primary spermatocytes are also diploid cells, meaning that they still carry 46 chromosomes.

Each primary spermatocyte replicates its genetic material and then goes through meiosis I to produce two daughter haploid cells called secondary spermatocytes, each of them carrying 23 chromosomes. Each secondary spermatocyte will produce two other haploid daughter cells by meiosis II.

The total result from the two cellular divisions of each primary spermatocyte is four haploid daughter cells called spermatids.

During spermiogenesis, spermatids mature into spermatozoa or sperm cells. Each sperm cell characterizes by being composed of a head, midpiece, and tail.

  • DNA replicates once, but cells divide twice TRUE
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  • One spermatogonium produces 4 spermatids FALSE. One primary spermatocyte produces 4 spermatids.
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Answer:D

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