If the haploid number for a plant species is 4, how many...

Question

If the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.

pentaploidy

Accepted Answer

Hi, everyone. Let's look at our next question. The presence of five sets of chromosomes in a cell is called Penta POY. What is the main cause of Penta? Choice? A fusion of three diploid and one haploid set of chromosomes. Choice B, fusion of two haploid and one haploid sets of chromosomes. Choice C failure of cytokinesis during cell division or choice D deletion of a chromosome in a diploid cell. So we're thinking about the situation where we end up with five sets of chromosomes in a cell. In that case, we can eliminate two answers right away. In choice A, we have the fusion of three diploid and one haploid set of chromosomes. Well, fusions of multiple sets of chromosomes is what leads to things like Penta ploy. But this doesn't add up to the correct number. In this case, we have three diploid sets that would be three multiplied by two because diploid involves two sets of chromosomes and one half light set. So added to one that equals seven sets of chromosomes. So that will not lead to plate and it is not our correct answer. The same is true of choice B which has a fusion of two haploid and one haploid set of chromosomes. Well, two haploid sets will be two times or multiplied by one. Since a haploid set obviously has one set of chromosomes. And then we add that to one haploid set and we get three sets of chromosomes. So that's a triploid cell, not a Penta cell. So choice B is not correct. And then when we look at choice D, it says deletion of a chromosome in a diploid cell. Well, that will lead to an E or an abnormal number of chromosomes, not Penta, Penta is five complete sets. So choice D is obviously not correct either. So we're left with choice C it says failure of cytokinesis during cell division. And that is indeed correct. That fail when the cells fail to divide into two daughter cells, the result can be fusion of multiple sets of chromosomes as we saw in A and B. Those just weren't the correct number. So choice C failure of cytokinesis is our correct answer. See you in the next video.

If the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.

pentaploidy

Key Concepts

Haploid and Diploid Numbers

Polyploidy

Chromosome Count in Polyploid Organisms

Watch next

If the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.pentaploidy

Key Concepts

Haploid and Diploid Numbers

Polyploidy

Chromosome Count in Polyploid Organisms

Watch next

If the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.

pentaploidy