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Let Y be the genotypic symbol for dominant yellow seed colour, symbol y for recessive green seed colour, symbol R for dominant round shape of seed and symbol r for recessive wrinkled seed shape in garden pea. Using these symbols explain the Mendels law of independent assortment. 

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According to the law of independent assortment, when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together.
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ANSWER THE FOLLOWING QUESTIONS ON A ONE WHOLE SHEET OF PAPER.
  1. The ability to taste the chemical PTC is determined by a single gene in humans with the ability to taste given by the dominant allele T and the inability to taste by the recessive allele t. Suppose two heterozygous tasters (Tt) have a large family. Predict the proportion of their children who will be tasters and non-tasters. Use a Punnett square to illustrate how you make these predictions. What is the likelihood that their first child will be a taster?
  2. In a certain plant, blue (B) flower color is dominant over white (b). You have a blue-flowered plant and a white-flowered plant. What do you know about the genotype and phenotype of each plant? Now you cross the plants and all the offspring are blue. What have you learned about the genotypes of the original plants?
  3. Consider the blue-flowered plants produced from the above cross: what gamete types will they produce? If you cross two of these blue-flowered plants to produce a large number of offspring, what genotypes and phenotypes will be produced, and in what proportions?
  4. In pepper plants, green (G) fruit color is dominant to red (g) and round (R) fruit shape is dominant to square (r) fruit shape. These two genes are located on different chromosomes. What gamete types will be produced by a heterozygous green, round plant? If two such heterozygous plants are crossed, what genotypes and phenotypes will be seen in the offspring, and in what proportions? (USE PUNNET SQUARE)
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Question Text
Let Y be the genotypic symbol for dominant yellow seed colour, symbol y for recessive green seed colour, symbol R for dominant round shape of seed and symbol r for recessive wrinkled seed shape in garden pea. Using these symbols explain the Mendels law of independent assortment. 
TopicPrinciples of Inheritance and Variation
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes88