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- There are two incomplete-dominant alleles for petal color in a population of flowers. 36% of the flowers have red petals, 16% of the organisms have white petals, and 48% of the flowers have pink petals. What percentage of alleles in this population code for red petals (R)? how can i calculate it?In plants known as “ four o’ clocks”, the allele for the dominant red- flower color is is completely dominant over the allele for white-flowers. A gardener allows several heterozygous pink-flowered four o'clock to self pollinate and collects 200 seeds. Identify the flower color phenotypes and theoretical percentage.Half of the worlds population eats rice at least twice a day. Much of this rice is grown in flooded conditions, and different strains of rice are tolerant (survive) or intolerant (die) under these conditions. Rice breeders used genetic crosses to test whether tolerance to flooding is a dominant trait. Researchers used three true-breeding flood-tolerant strains, FR143, BKNFR, and Kurk, and two true-breeding flood- intolerant strains, IR42 and NB, in the crosses. Results were obtained from three sets of crosses and are reported in the Table below: Results of cross of F1 to tolerant parent: F1 plants were crossed with the tolerant parent of the cross. Number of Plants Progeny Analyzed from Intolerant Tolerant Cross Alive Dead Total 1. F2 results of cross: IR42 FR13A 187 77 264 IR42 BKNFR 192 73 265 NB Kurk 142 52 195 2. Results of cross of F1 to intolerant parent: (F1 of IR42 FR13A) IR42 14 17 31 (F1 of IR42 BKNFR) IR42 15 10 25 (F1 of NB Kurk) NB 21 35 56 3. Results of cross of F1 to tolerant parent: (F1 of IR42 FR13A) FR13A 31 0 31 (F1 of IR42 BKNFR) BKNFR 28 0 28 (F1 of NB Kurk) Kurk 40 0 40 Do the data support the hypothesis that the tolerance trait is dominant? Justify your conclusion by explaining the results from each of the three sets of crosses in terms of genotypes and phenotypic ratios. Source: T. Setter et al. 1997. Physiology and genetics of submergence tolerance in rice. Annals of Botany 79:6777.
- In a population of plants, leaf hairiness is determined by a single locus with two alleles: H and h. Out of 319 individuals in the population, 25 % are completely hairy, 9 % are partially hairy, and the remaining are hairless. Complete hairiness is caused by homozygosity of the H allele at a single locus; hairlessness is caused by homozygosity of the h allele at that locus; heterozygotes are partially hairy. What is the expected (predicted under H–W) number of individuals with partially hairy leaves?In eggplants, fruit color is due to two alleles with the Purple allele (CP) incompletely dominant over White (CW). Plants that are heterozygous for this allele produce light violet colored fruit. A biologist surveys a field of eggplants that has been left alone for several years, allowing the eggplants to reproduce and grow without harvesting or disturbance. She finds that 600 of the plants make purple fruits, 200 make light violet fruits, and 200 produce white fruits. Calculate p (fraction of CPalleles in the populations): Calculate q (fraction of CWalleles in the populations): If this population of plants is at Hardy-Weinberg Equilibrium, what fractions (round to two decimal places) of the next generation of egg plants will produce Purple, White, and Violet fruits? Purple: Violet: White: If the frequency of white alleles was actually much higher in next generation than expected, and continued to increase in future generations, and the population stays relatively large, what type of…Imagine a population 528 individual plants. In this population, 4 % of the plants produce red flowers, and 9 % produce pink flowers. The remaining plants produce white flowers. Flower colour is attributed to a single locus with two alleles. Red flowers are produced by plants that are homozygote for the R allele. White flowers are produced by plants that are homozygote for the W allele. Heterozygotes (RW) produce pink flowers. What is the expected (under Hardy-Weinberg equilibrium) number plants producing pink flowers in this population? Round your answer to the closest full number.
- The following table shows the results of differentmatings between jimsonweed plants that had eitherpurple or white flowers and spiny or smooth pods.Determine the dominant allele for the two traits andindicate the genotypes of the parents for each of thecrosses.Parents OffspringPurple White Purple WhiteSpiny Spiny Smooth Smootha. purple spiny × purple spiny 94 32 28 11b. purple spiny × purple smooth 40 0 38 0c. purple spiny × white spiny 34 30 0 0d. purple spiny × white spiny 89 92 31 27e. purple smooth × purple smooth 0 0 36 11f. white spiny × white spiny 0 45 0 16Let’s suppose that pigmentation in a species of insect is controlledby a single gene that exists as two alleles, D for dark and d for light.The heterozygote, Dd, is intermediate in color. In a heterogeneousenvironment, the allele frequencies are D = 0.7 and d = 0.3. Thispolymorphism is maintained because the environment has somedimly lit forested areas and some sunny fields. During a hurricane,a group of 1000 insects is blown to a completely sunny area. In thisenvironment, the relative fitness values are DD = 0.3, Dd = 0.7, anddd = 1.0. What are the predicted allele frequencies in thenext generation?You are studying a population of giraffes. In this population, one gene (G) controls spot color in giraffes, which shows incomplete dominance. Individuals with white spots are homozygous gg, individuals with brown spots are homozygous GG, and heterozygotes have orange spots (Gg). You observe 25 white-spotted giraffes, 15 orange-spotted giraffes, and 22 brown-spotted giraffes. Calculate the observed allele frequencies, using p for the frequency of allele G, and the expected number of giraffes of each phenotype assuming Hardy-Weinberg Equilibrium (do not do the entire chi-square calculation!). For frequencies, report four positions after the decimal. For expected numbers, report two positions after the decimal. p = q = Expected number of orange-spotted = Expected number of brown-spotted = Expected number of white-spotted =
- In garden pea plants, the yellow seed colour (Y) is dominant over the green seed colour (y). In a population of 24 pea plants, 15 pea plants are homozygous dominant, 6 are heterozygous dominant, and 3 are recessive. Find the frequency of the following YY, Yy, yy. Show all work and record your response using three significant digits.In one variety of silkmoth (bombyx mori) the caterpillar were stripe and the cocoons wear yellow. In other variety, the caterpilaars were not striped and the cocoons were white. From previous crosses, striped was known to be dominant over not striped and yellow over white . The following were the results from the crosses between striped, yellow and not striped, white moths: Striped, yellow 310 striped, white 108 Not Striped, yellow 99 Not striped, white 32 Give the total: ____ Degrees of freedom: _____ Chi-square computed: ____ Accepted Hypothesis:___________ (Round off all answers to 3 decimal places)In some populations of grasses, the ability to grow in soil sprayed with a certain herbicide is a dominant trait determined by the allele "R". In a population at genetic equilibrium, 91% of the seeds can germinate in sprayed soil. What are the frequencies of "R" and "r"? What percentage of the plant that germinates in the soil will be heterozygotes?