Cross a heterozygous tall, true-breeding yellow podded pea plant with a homozygous tall, hybrid green podded pea plant. (Tall is dominant over short, Green pods are dominant over yellow) 2 factor cross problem
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Cross a heterozygous tall, true-breeding yellow podded pea plant with a homozygous tall, hybrid green podded pea plant. (Tall is dominant over short, Green pods are dominant over yellow)
2 factor cross problem
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- More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross: P1: AABBCCDDEE aabbccddee F1: AaBbCcDdEe (self-cross to get F2) What is the chance of getting an AaBBccDdee individual in the F2 generation?Figure 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?More Crosses with Pea Plants: The Principle of Independent Assortment Two traits are examined simultaneously in a cross of two pure-breeding pea-plant varieties. Pod shape can be either swollen or pinched. Pea color can be either green or yellow. A plant with the traits swollen and green is crossed with a plant with the traits pinched and yellow, and a resulting F1 plant is self-crossed. A total of 640 F2 progeny are phenotypically categorized as follows: 360 swollen yellow 120 swollen green 120 pinched yellow 40 pinched green a. What is the phenotypic ratio observed for pod shape? Pea color? b. What is the phenotypic ratio observed for both traits considered together? c. What is the dominance relationship for pod shape? Pea color? d. Deduce the genotypes of the P1 and F1 generations.
- Variations on a Theme by Mendel Pea plants usually have white or red flowers. A strange pea-plant variant is found that has pink flowers. A selfcross of this plant yields the following phenotypes: 30 red flowers 62 pink flowers 33 white flowers What are the genotypes of the parents? What is the genotype of the progeny with red flowers?Variations on a Theme by Mendel A characteristic of snapdragons amenable to genetic analysis is flower color. Imagine that a true-breeding red- flowered variety is crossed to a pure line having white flowers. The progeny are exclusively pink-flowered. Diagram this cross, including genotypes for all P1 and F1 phenotypes. What is the mode of inheritance? Let F = red and f = white.Punnett Square/Mono-Hybrid Cross: In cattle, black coat color is dominant to red coat color. Both parents are heterozygous. What are the possible genotypes & phenotypes of the progeny? What is significant about this type of cross?
- Based on Mendel’s experimental crosses, what is the expected F2phenotype ratio of a single-factor cross?a. 1:2:1b. 2:1c. 3:1d. 9:3:3:1e. 4:1Tall (T) pea plants are dominant over short (t) pea plants. What is the probability of getting 3 tall and 4 short pea plants from a cross between 2 heterozygous tall plants. (report to three nonzero digits.)A certain plant species has dominant red flower color (R) to the recessive white flower color (r). A pure breeding (homozygous) red-flowering plant is crossed with a pure breeding white-flowering plant. What are the possible outcomes for the F1 generation? (Show the Punnett square
- A heterozygous green (Gg) tall (Tt) plant is crossed with a heterozygous green (Gg) tall (Tt) plant. Calculate the possible genetic outcomes.A male dog of genotype Aa is crossed with a female dog of genotype AA. Both are large breed, medium breed to recessive result. Determine the genotype and phenotype of the cross.Mendel crossed peas having round seeds and yellow cotyledons with peas having wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram this cross through the F2 generation, using both the Punnett square and forked-line methods.
