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Flower color in pea plants was the very first trait we discussed. On a molecular level, what causes a PP or Pp plant to grow purple flowers, and a pp plant to grow white flowers?
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- Two plants with white flowers, each from true-breeding strains, were crossed. All the F1 plants had red flowers. When these F1 plants were intercrossed, they produced an F2 consisting of 177 plants with red flowers and 142 with white flowers. (a) Propose an explanation for the inheritance of flower color in this plant species. (b) Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps in this pathway.Round (R) seed shape is dominant to wrinkled (r) seed shape in pea plants. If an RR plant is crossed with an rr plant, what is the frequency of phenotypes in the F2 generation? 1)1/4 RR, 1/2 Rr, 1/4 rr 2) All round seeds 3) 3 roundseeds, 1 wrinkled seed 4) All wrinkled seedsFigure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
- In a trihybrid cross of a tall, purple-flowered pea plant with round seeds (TtPpRr) with a short, white- flowered pea plant with round seeds (ttppRr), what is the probability: A) that a short, white-flowered plant with wrinkled seeds will be produced? B) that a tall, purple-flowered plant with round seeds will be produced? C) that a tall, white-flowered plant with round seeds will be produced?In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over non-bitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. The F1 are intercrossed to produce the F2. Q. An F1 plant is crossed with a plant that has glossy, cream fruit and nonbitter cotyledons. Give the phenotypes and expected proportions among the progeny of this cross.In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over non-bitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. The F1 are intercrossed to produce the F2. Q. Give the phenotypes and their expected proportions in the F2.
- In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over non-bitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. The F1 are intercrossed to produce the F2.a. Give the phenotypes and their expected proportions in the F2.b. An F1 plant is crossed with a plant that has glossy, cream fruit and non bitter cotyledons. Give the phenotypes and expected proportions among the progeny of this cross.In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over non-bitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. The F1 are intercrossed to produce the F2. a. Give the phenotypes and their expected proportions in the F2. b. An F1 plant is crossed with a plant that has glossy, cream fruit and nonbitter cotyledons. Give the phenotypes and expected proportions among the progeny of this cross.In tomatoes, the red fruit color is completely dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow and the progeny are allowed to self pollinate. What phenotypes do you predict in the F2 generation? a) 3 red: 1 yellow b) 9 red : 3 orange : 1 yellow c) 1 red : 2 orange : 1 yellow d) 1 red : 1 yellow
- In an intra-species cross performed in mustard plants of two different species (Brassica juncea and Brassica oleracea), a tall plant (TT) was crossed with a dwarf (tt) variety in each of the two species. The members of the F1 generation were crossed to produce the F2 generation. Of the F2 plants, Brassica juncea had 60 tall and 20 dwarf plants, while Brassica oleracea had 100 tall and 20 dwarf plants. Use chi-square analysis to analyze these results.In the rare rainbow rose, it has been shown that flower color is controlled by 2 genes. No one knows how the 2 genes are related and several hypotheses have emerged to explain how they interact to produce flowers with purple, yellow, and green pedals. You cross purple and green flowering plants, and find that F1 are all yellow colored. You allow F1 to self-fertilize and this produces 222 purple, 222 yellow and 222 green flowers. The 2 most popular theories are: a co-dominance relationship or an epistatic relationship between the 2 genes. Your team deduces that if co-dominance should result in 216 purple, 220 yellow and 230 green. Where as, an epistatic relationship should result in 250 purple, 200 yellow, and 216 green 1-Calculate the chi-squared value for the co-dominance hypothesis? (Give your answers with 3-decimal places e.g. 45.022)In the rare rainbow rose, it has been shown that flower color is controlled by 2 genes. No one knows how the 2 genes are related and several hypotheses have emerged to explain how they interact to produce flowers with purple, yellow, and green pedals. You cross purple and green flowering plants, and find that F1 are all yellow colored. You allow F1 to self-fertilize and this produces 222 purple, 222 yellow and 222 green flowers. The 2 most popular theories are: a co-dominance relationship or an epistatic relationship between the 2 genes. Your team deduces that if co-dominance should result in 216 purple, 220 yellow and 230 green. Where as, an epistatic relationship should result in 250 purple, 200 yellow, and 216 green. 1-Which hypothesis is correct? a- Co-dominace b- Epistatic and The odds the theory you selected is correct is (less or greater) than (10%,25%,50%,90%)