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- 下午7:08 1月27日周四 98% Yuki 1.23 AP环科课后作业和课堂笔记.pdf •.. 34. Which of the following statements about genetic diversity is true? (A) Genetic uniformity of a crop increases the crop’s overall resistance to pests and disease. (B) Genetic resistance to pests and diseases can be increased by crossing a crop plant with ancestral varieties. (C) Genetic engineering technology is used to increase genetic diversity by creating new species with synthetic genes. (D) Genetic diversity within populations of common crop species such as corn is typically high. (E) Genetic diversity is usually high in endangered species.Part A Why is mimicry evolutionarily advantageous (helpful/beneficial)? U =- E E XA PLAYOne of the effects of climate change on ecological communities is the disruptionof seasonal timing or phenology. A team of biologists is trying to determine the potential forrapid evolutionary responses of plants to changing seasonal conditions. They do alaboratory selection experiment on flowering time in an annual plant to test for the presence ofadditive genetic variance for this trait. They measure the time between germination andflowering for 400 plants under controlled laboratory conditions and then use 25% with theshortest flowering times to find a second generation in the lab (with pollination based onrandom number sampling). The mean flowering time for the overall parental population was 80days. The mean for the selected 25% of individuals was 60 days. In the offspring generation, themean flowering time was 70 days. 6a. What is the narrow-sense heritability for flowering time for these plants under laboratoryconditions? 6b. If you performed another round of selection on the…
- Roughly 30% of harvested cantaloupesare wasted because they become overripebefore reaching consumers. Agricultural scientistshave used genetic engineering to insert an applegene into the cantaloupe genome to produce atransgenic (GM) cantaloupe that ripens more slowlyafter harvesting. Is this approach less desirablethan the marker-assisted breeding describedabove? Why or why not?CH 1-4 X ← → C Maya X Credibi X app.wizer.me/learn/00E0A8 wizer.TIE a Maya S x BW x BW To-do X Assign x b M Dashb X BB x BW Figura X Figurat X A chicken breeder has chickens that are white, black, or speckled. Speckled chickens have both black and white feathers. The allele for white feathers is (W). The allele for black feathers is (B). Determine the genotypes of the rooster and hen that would breed the greatest percentage of speckled chickens. BW x WW Dashboard Incomp X Interac X STILCI GIESS LUUC BB x WW + with white (W). The heterozygous phenotype is brown and white V < ☆ GO> NEXT A BOOKMARK Question 23/28 According to the probability of the pea plant offspring in chart 2, what percentage of the offspring will be yellow in color? Use the diagrams below to answer the questions that follow. 23 Pea Plants Chart 1 A 5% Punnett Square B) 19% с) 30% Aa Aa D 25% Aa A a E) 75% Chart 2 AaBb x AaBb AB Ab aB ab Key AB AABB AABB Ab AABB AABB AaBb AA - Green BB - Smooth AAbb AaBb Aabb AABB AaBb aa - Yellow aB AaBb aaBB aaBb bb - Rough ab Aabb aaBb aabb
- A marijuana grower in Ft Jones, CA would like to increase the average amount of THC in his crop. He has estimated that the concentration in his current crop is 19 mg/g of product. The grower selects the top 7 male and 7 female plants in his current population and allows them to intercross. After pollination, the grower estimates that the average THC concentration in these plants is a bomber 30 mg/g THC! He plants the F1 seeds and after the next growing season finds that the average THC concentration is 26 mg/g THC in these plants. Unfortunately, the grower started listening to his old Deep Purple 8 tracks and can't find the notebook in which he recorded this information. 1. Can you please tell the grower what the selection differential for THC production was that produced this crop? 2.Can you please remind the grower what is the response to selection for THC production was in this population? 3 .Can you please tell the grower what the narrow-sense heritability is for THC production in…The wing polymorphic oricket, Grylus deaensis, has some individuals who are capable of long flights fong legs, trong fight muscles) and olhers who are not (short legs, weak tight muscles) Fight-capable orioeta have delayed reproduction, with lower ovarian function in females and less courtahip song production in males A biologist genotypes a population of orickats ving in an urtan feld in Dalas at the wing gene, which has two aleles, W and w Crickets with at least one oopy of the Watele are fight capable, while ww homarygoles are fight-incapable. She finds 12 crickets with genotype WW. 35 with genotype Ww and 63 with genotype ww. Keep these numbers for the next two questiona What is the frequency of the W allele?Write the definition of the following terms: 1. Semelparous life history 2. Iterous species 3. Senescence 4. Antagonistic pleiotropy 5. Carrying capacity
- 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?Selective breeding artificial traits crop species hyprid Domestic diverse population 1. occurs when humans take control of the breeding process. 2. The favorable to be passed on are chosen by the breeder to create a new or improved variety. 3. Farmers have bred like corn, to produce more food in a smaller area. 4. These plants result by crossing parent plants for their desired traits. 5. animals, like dog breeds, have also been bred to be incredibly compared to the diversity of their ancestors. 6. This selecting of traits is also known as selection. 7. Similar to natural selection, the of a species changes over time, and some traits become more common.Bruce Ames and his colleagues have pointed out that although detailed toxicological analysis has been conducted on synthetic chemicals, almost no information is available about the mutagenic or carcinogenic effects of the toxins produced by plants as a natural defense against fungi, insects, and animal predators. Tens of thousands of such compounds have been discovered, and he estimates that in the United States adults eat about 1.5 g of these compounds each daylevels that are approximately 10,000 times higher than those of the synthetic pesticides present in the diet. For example, cabbage contains 49 natural pesticides and metabolites, and only a few of these have been tested for their carcinogenic and mutagenic effects. a. With the introduction of new foods into the U.S. diet over the last 200 years (mangoes, kiwi fruit, tomatoes, and so forth), has there been enough time for humans to develop resistance to the mutagenic effects of the toxins present in those foods? b. The natural pesticides present in plants constitute more than 99% of the toxins we eat. Should diet planning, especially for vegetarians, take into account the doses of toxins present in the diet?
