To determine: The interpretation made by the given results and also estimate their mode of inheritance.
Introduction: The fruit-shaped plant Plectritis congesta is of two types. One individual can bear the wingless fruits, whereas another can bear the winged fruits. The three plants which were collected at random (before flowering) from nature were crossed to find out the dominant as well as a recessive character among fruits.
To determine: The nongenetic explanations for the specified
Introduction: Nongenetic characters or inheritance are called the characters, which are not exhibiting the same trait or not relayed to their genetics (or 'missing heritability). The other factors influence such types of behaviors.
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Introduction to Genetic Analysis
- Two pumpkins plants have the following genotype: EeFfGg and EeFfGg. Assume genes E, F and G are independently assorting. How probable is this most probable phenotype of offspring of these pumpkins plants?arrow_forwardA pure breeding strain of squash that produced disk-shaped fruits was crossed with a pure- breeding strain having long fruits. The first filial generation had disk fruits, but the second filial generation showed a new phenotype, sphere, and was composed of the following proportions: disk 270, sphere 178, long 32. Propose an explanation for these results, and show the genotypes of P, First filial generation and second filial generation.arrow_forwardIn 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.arrow_forward
- 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.arrow_forwardIn 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.arrow_forwardIn 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.arrow_forward
- J.W. McKay crossed a stock (true-breeding) melon plant that produced tan seeds with a plant that only produced red seeds and obtained the following results (J.W. McKay. 1936. Journal of Heredity 27:110-112). Cross F1 F2 Tan x red 13 tan 93 tan, 24 red a) Explain the inheritance of tan seeds and red seeds in this plant. b) Assign symbols for the alleles in this cross and draw out the Punnett Squares for the initial cross and the F1 cross.arrow_forwardIn some plants a red flower pigment, cyanidin, is synthesized from a colorless precursor. The addition of a hydroxyl group (OH-) to the cyanidin molecule causes it to become purple. In a cross between two randomly selected purple varieties, the following results were obtained: 94 purple 31 red 43 white How many genes are involved in the determination of these flower colors? Which genotypic combinations produce which phenotypes? Diagram the purple * purple cross.arrow_forwardJ. W. McKay crossed a stock melon plant that produced tan seeds with a plant that produced red seeds and obtained the following results (J. W. McKay. 1936. Journal of Heredity 27:110–112). Cross F1 F2 tan ♀ × red ♂ 13 tan seeds 93 tan, 24 red seeds a. Explain the inheritance of tan and red seeds in this plant. b. Assign symbols for the alleles in this cross and give genotypes for all the individual plants.arrow_forward
- Flower color in petunias is determined by the biochemical pathway shown below: A_ B_ C_ Yellow Orange > Green Blue aa bb Plants of genotype AAbbcc were mated to plants of genotype AaBbCc. Determine the phenotypic ratio expected from this cross and fill in the spaces in the ratio below with whole numbers in lowest form. lf none are expected in a class, then type the number 0 in the space. Yellow: Orange : Green: Bluearrow_forwardIn corn, a pair of genes determines leaf shape and another pair determines pollen shape. A ragged-leafed plant with round-pollen was crossed to a ragged-leaf plant with angular pollen, and the resultant progeny were classified as follows: 186 ragged-leaf round-pollen 174 ragged-leaf angular pollen 57 smooth-leaf round pollen 63 smooth-leaf angular-pollen provide your hypothesis of the genotypes for the two parents. According to your hypothesis, what numbers would you have expected for each of the four classes of progeny? Follow the format of the number with the phenotypes in the question above. Test your hypothesis statistically using the chi-square method and indicate whether you accept or reject your hypothesis. Show your solutions.arrow_forwardConsider the following crosses in Drosophila. The two traits being investigated involve eye color and the presence or absence of wing crossveins. The outcomes of four crosses are shown below.›arrow_forward
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