Maize is a highly cross-pollinated crop and heterotic phenomenon is evident from the currently available hybrids. If you are given a huge random germplasm pool of maize, what procedure you will adopt to develop competitive high yielding hybrids.
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Maize is a highly cross-pollinated crop and heterotic phenomenon is evident from the currently available hybrids. If you are given a huge random germplasm pool of maize, what procedure you will adopt to develop competitive high yielding hybrids.
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- If a hybrid corn is planted in a poor soil, will it hybrid characteristics still exhibit? why?For each of the following statements, indicate whether the statement describes the P generation, F1 generation, or F2 generation. The plants in the P generationF1 generationF2 generation were allowed to self-pollinate. The plants in the P generationF1 generationF2 generation are true breeding. After a cross, there are three times as many tall plants as there are short plants in the P generationF1 generationF2 generation.Why is it so expensive to produce a hybrid plant seed?
- When two plants belonging to the same genus but different species are crossed, the F1 hybrid is more viable and has more ornate flowers. Unfortunately, this hybrid is sterile and can only be propagated by vegetative cuttings. Explain the sterility of the hybrid and what would have to occur for the sterility of this hybrid to be reversed.A farmer obtained pure seed of wheat variety (Galaxy-13) but unfortunately he has mixed it with other varieties in his field while he was planning to use that seed for next year. Being a plant breeder, suggest a method in detail to the farmer, that how he can get the pure seed again from that mixed lotTwo true breeding plants are cross pollinated. One plant is homozygous dominant for heightand color while the other is homozygous recessive for height and color. (A:tall, a:short, B:brown,b:red) The F1 plants are allowed to self-fertilize to produce an F2 generation. After conductingan experiment we get the following results:398 tall and brown plants122 tall and red plants128 short and brown plants45 short and red plants Using the Chi Square formula and table, determine if your results support the hypothesis ofindependent assortment or not. Show your work. You don’t need to show your Punnett Squaresif you include a statement as to how you figured out the appropriate phenotypic ratio for the F2generation. Round to 1 decimal.4a. What possible gametes can the following individual make: AaBb4b. What possible gametes can the following individual make: AaBbCC
- You successfully isolate an hsf2/hsf2; hsf3/hsf3 double mutant stock. You cross this plant to an hsf1/hsf1 plant and then self-pollinate the F1. You want to recover at least 10 triple mutant homozygous to evaluate the phenotype. How many plants do you need to genotype to expect to recover 10 triple mutant plants?We cross two short, non-purple F2 plants. What ratio of the progency will be short and non-purple in the F3 generation? 9/16 16/16 1/16 3/-6Let's say that you were a farmer and you have a field of peas of various genotypes. Pretend that you only want to produce wrinkled peas. What would you do with your current plants to ensure that the next generation is mostly wrinkled peas? (You can't buy different plants; work with what you have.)
- From an agricultural point of view, discuss the advantages and disadvantagesof selective breeding. It is common for plant breeders to take two different, highly inbred strains, which are the product of many generations of selective breeding, and cross them to make hybrids. How does this approach overcome some of the disadvantages of selective breeding?A plant breeder found a species of flowering plant with very attractive flowers growing wild in a field and she thought it would appeal to her customers. Some of the plants of this species had red flowers, some white flowers, and some pink flowers. While she would like to be able to offer her customers all three colors of flowers, she only has permission from the landowner to dig up one plant to bring back to the nursery as breeding stock. What would be the best thing for her to do? Top of Form Take a white flowering plant since the white allele could be masking the pink allelle. Take a pink flowering plant since it is likely to carry both the red and white alleles. Take a red flowering plant since it could produce all three colors eventually. Take a red flowering plant since the red allele is likely the dominant one.The best way to determine the genotype for a plant presenting with dominant phenotypes is by performing a test cross. Test crosses are always performed with a true-breeding plant with recessive traits. What would be the phenotype and genotype of the plant you would need to perform the test-cross with your tall, purple plant?After performing the test-cross with your unknown purple, tall plant you find that all your resulting plants are tall; half have white flowers, and half have purple flowers. What was the genotype of your original purple, tall plant?
