New allopolyploid plant species can arise by hybridization betwee...

Question

New allopolyploid plant species can arise by hybridization between two species. If hybridization occurs between a diploid plant species with 2n = 14 and a second diploid species with 2n = 22, the new allopolyploid would have 36 chromosomes.

What pattern of speciation is illustrated by the development of the allopolyploid species?

Accepted Answer

Hey, everyone. Let's take a look at this question together. Which of the following is a mechanism of hybrid speciation through which the hybrid offspring has more chromosomes than either parent species. Is it answer choice? A genome doubling, answer choice B point mutation, answer choice C, both answer choice A and B or answer choice D hybrid as between two closely related species. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer. So since we are looking for a mechanism of hybrid speciation through which that hybrid offspring has more chromosomes than either parent species, we can go ahead and eliminate answer choice B to. We are not talking about a point mutation which is a mutation in the genomic sequence. And since answer choice B is incorrect, answer, choice C must also be incorrect. And now we have to decide whether it is genome doubling or hybridization between two closely related species. However, this mechanism of hybrid speciation involves hybrid offspring having more chromosomes than either parent species, which means that the offspring inherits a complete set of chromosomes from both parents. And since they are inheriting them from both parents. That means that the offspring would have twice as many chromosomes as either parent, which means that the number of chromosomes in their offspring would double since they have twice as many as either parent. And the name for this mechanism is genome doubling. So answer choice. A genome doubling is the correct answer since it describes a mechanism of hybrid speciation through which the hybrid offspring has twice as many chromosomes as either parent. I hope you found this video to be helpful. Thank you and goodbye.

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