Dr. Ara B. Dopsis has an idea he thinks will be a boon to agri...

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. Will this hybrid be infertile?

Accepted Answer

Hello everyone and welcome to today's video. So, Doctor Shar Dx wants to create a hybrid between a donkey between parenthesis two N equals 62 a horse between parenthesis two, N equals 64 to create a new species called a donor, which is a hybrid between the two. Now, he plans to induce chromosome doubling in the hybrid to stabilize the genome. What is the most likely outcome regarding the fertility of the resulting Dawn horse? As answer choice. A we have the dan hos will be infertile due to genetic incompatibility between the two species. As answer choice B, we have the don horse will be fertile and able to produce offspring with both donkeys and horses. As answer choice C, we have the donor will be fertile but we'll only be able to produce offering with either donkeys or horses but not both. And as answer choice D we have the chromosome process will be or the chromosome doubling process will fail and no viable offering will be produced. Now, we're going to be introducing chromosome doubling in order to stabilize the genome. But remember that we are mating a donkey which is two N equals 62 and a horse which is two N equals 64. Now, the number of chromosomes for this horse is most likely going to be two N equals 63. Now, although donkeys and horses are closely related and can produce viable offspring, these hybrids are almost always infertile due to differences in chromosome number and structure. Now, the difference in chromosome number between the two species means that the hybrid will most likely have a an odd number of chromosomes, which can lead to infertility. Even if chromosome doubling were successful, there will still be certain genetic incompatibilities between the two species that will result in infertility. Therefore, the correct answer choice here is going to be answer choice. The donors will be infertile due to genetic incompatibility between the two species related to chromosome number and chromosome structure. And that will be your final answer. I really hope this video helped you and I hope to see you on the next one.

Key Concepts

Hybridization

Chromosome Number and Fertility

Polyploidy

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