When red and white flowering Mirabilis plants are crossed F1 shows all pink flowers when the progeny is Selfed the expected phenotypic and genotypic ratios are?
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No worries! We‘ve got your back. Try BYJU‘S free classes today! No worries! We‘ve got your back. Try BYJU‘S free classes today! No worries! We‘ve got your back. Try BYJU‘S free classes today! Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses Solution The correct option is D Rr; Incomplete dominanceWith respect to the inheritance of flower colour in snapdragon, allele ‘R’ imparts red colour to the petals of the flower and the allele ‘r’ imparts white colour to the petals of the flower. However, the allele ‘R’ is not completely dominant over ‘r’ and due to this, a cross between true-breeding red-flowered (RR) and white -flowered plants (rr) results in pink-flowered plants (Rr). Hence, the progeny of this cross does not resemble either of the two parents with respect to the flower colour, rather an intermediate phenotype is seen. This phenomenon is known as incomplete dominance. In the case of co-dominance, the F1 generation resembles both the parents. Generally, a gene has two alleles, but certain genes have more than two alleles and these are called multiple alleles. However, in an individual, only two alleles are present. Hence, inheritance of flower colour in snapdragon is an example of incomplete dominance.
Problem 10: Disappearance of parental phenotypes in the F1 generationA genetic cross of inbred snapdragons with red flowers with inbred snapdragons with white flowers resulted in F1-hybrid offspring that all had pink flowers. When the F1 plants were self-pollinated, the resulting F2-generation plants had a phenotypic ratio of 1 red: 2 pink: 1 white. The most likely explanation is: TutorialIncomplete dominance
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Biology Project http://www.biology.arizona.edu Correct option (c) 1:2:1 and 1:2:1 Explanation: Son.retimes two genes of the allelomorphic pair do not show a dominant-recessive relationship, but when presents together, they show intermediate trait or incomplete dominance. Incomplete dominance is not blending inheritance because parental characters reappear in F2 generation. ln Mirabilis jalapa, there are two types of pure breeding plants, red flowered and white flowered. On crossing them the F1 plants or hybrids possess pink flowers. On selfing them, F2 generation has plants in the ratio of 1 red: 2 pinks: 1 white-flowered plants with the phenotypic ratio being the same as a genotypic ratio. Genotypic ratio= 1RR: 2Rr: 1rr Phenotypic ratio: 1 Red : 2 Pink : 1 White Both genotypic ratio and phenotypic ratio are same, i.e., 1 :2 :1.
Register now for special offers +91 Home > English > Class 12 > Biology > Chapter > 5 Principles Of Inheritance And Variation > When red and white flowered Mi... Video Solution: When red and white flowered Mirabilis plants are crossed, all pink flowers are produced in F_(1) generation. When F_(1) progeny is selfed , the expected phenotypic and genotypic ratios are, respectively . UPLOAD PHOTO AND GET THE ANSWER NOW! Text Solution `1 : 2 : 1 and 3 : 1``3 : 1 and 1 : 2 : 1``1 : 2 : 1 and 1 : 2 : 1``1 : 1 and 1 : 1: 1` Answer : C Answer Step by step video solution for [object Object] by Biology experts to help you in doubts & scoring excellent marks in Class 12 exams. Question Details till 08/10/2022
Related Biology VideosShow More Add a public comment... Follow Us: Popular Chapters by Class: When red and white flowered Mirabilis plants are crossed all pink flowers are seen in F1 progeny is Selfed the expected phenotypic and genotypic ratios are?Both genotypic ratio and phenotypic ratio are same, i.e., 1 :2 :1.
When red tailed Mirabilis crossed pink hybrids occur in F1 generation if this pink hybrid is then crossed with the white the phenotypic ratios among the progeny would be?So, the correct option is '1 pink: 1 white'.
When a red flower and a white flower are crossed all the offspring are pink How can this be explained?The crossing of a red flowered plant and a white flowered plant produces all the offspring with pink flowers. This cross illustrates red and white exhibit incomplete dominance. This situation occurs due to the blending of both the alleles.
When a red flower and a white flower are crossed and produce pink offspring what type of interaction is taking place?Figure 21: A cross between a red and white snapdragon will yield 100% pink offspring. This pattern of inheritance is described as incomplete dominance, meaning that neither of the alleles is completely dominant over the other: both alleles can be seen at the same time.
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