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Show how you could make an allotetraploid between two
related diploid plant species, both of which are 2n = 28.
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- How many chromosomes would be found in somatic cells of an allotetraploid plant if its parent species had diploid (2n) numbers of 4 and 6 respectively?The radish (Raphanus sativus) has a diploid number (2n) of 18. The cabbage (Brassica oleracia) also has a diploid number (2n) of 18. Why is it that if you cross these two species to produce a hybrid with a total of 18 chromosomes in its somatic cells it is sterile, but if you form an allotetraploid (also known as amphidiploid) from these two species it is fertile?A normal diploid version of a plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?
- By conducting testcrosses, researchers have found that the sweetpea has seven linkage groups. How many chromosomes would youexpect to find in leaf cells of the plants?In the following diagram, designate each daughter cell as diploid (2n) or haploid (n).Discuss the following sets of terms: a. trisomy and triploidy b. aneuploidy and polyploidy
- What would be the chromosome number of progeny resulting from the following crosses in wheat (see Figure )? What type of polyploid (allotriploid, allotetraploid, etc.) would result from each cross? Q. Einkorn wheat and emmer wheatWhat would be the chromosome number of progeny resulting from the following crosses in wheat (see Figure )? What type of polyploid (allotriploid, allotetraploid, etc.) would result from each cross? Q. Bread wheat and emmer wheatSeedless watermelons that you find in the supermarketare triploids, where x = 11.a. At what frequency are balanced gametes generatedby triploid watermelons?b. What is the probability that a particular seed in atriploid watermelon will be viable? (Recall that aviable seed is a euploid zygote.)c. What is the ploidy of the viable seed in part (b)?More than one answer may apply
- A diploid plant is heterozygous for two linked genes, A and B. Crossovers between the two genes occurs in ~10% of meiosis. Multiple crossovers are never observed in one cell undergoing meiosis. What fraction of the gametes produced by this diploid plant are expected to be recombinant type? O 5% O 10% 2.5% 25%In Question 23, if one chromosome has R and T and the homologous chromosome also has R and T, does linkage matter? What is the single type of genotype that this plant can produce in its gametes?How would you make a monoploid plantlet by starting with a diploid plant?