Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number.
How many chromosomes will the polyploid have after chromosome doubling?

Question

Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number.

How many chromosomes will the polyploid have after chromosome doubling?

Accepted Answer

Welcome back, everyone. Let's look at our next problem. Doctor Picasso wants to cross a female horse with a male donkey to create a new species. What will be the chromosome number in a hybrid produced by crossing a horse? Two N equals 64 with a donkey two, N equals 62. And our answer choices are a 31 B C 63 or D 64. Well, of course, when the horse and donkey are crossed, do you have the two gametes, the game from each that will fuse. So since we know the chromosome number, we know that the horse, the number of game eats in that reproductive cell. So in that egg Will be divided by two. So N will equal 32. Whereas the donkey Who has two n equal to And will therefore equal 31. So the new species which, well, it's not new in real life. If you do this cross, you'll get a mule will be formed, of course by the fusion of the two gametes. So the hybrid will end up with a chromosome number of end of the horse plus another donkey And that will equal 32 plus 31, which will equal 63. That is why the mule is sterile. Since 63 chromosomes being an odd number, you'll have one that does not pair up. Let's go over and answer choices. C Choice C is 63. So crossing a female horse with the male donkey to create a new species. What will be the chromosome number in a hybrid produced by this cross? And that is choice C- 63. See you in the next video.

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Key Concepts

Chromosome Number

Hybridization

Chromosome Doubling