What is the probability that a cross between a true-breeding pea plant with round seeds and a true-breeding pea plant with wrinkled seeds will produce F 1 progeny with round seeds? OA.0 B. 1/4 C. 1/2 D.1 OE. 1/8
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- B b В The Punnett square above shows a cross between two sweet pea plants in Mendel's greenhouse. Both parents have blue flowers (Bb). Which statement describes the offspring expected from this cross? 50% white-flowered and 50% blue-flowered 75% white-flowered and 25% blue-flowered 75% blue-flowered and 25% white-flowered D) 100% blue-flowered and 0% white-floweredIn the following cross, +s +a X +s +a, how many offspring do you expect to have wt eyes and wt wings? а. 3/16 b. 9/16 c. 1/16 d. 3/4a. 1 dominant allele will contribute 120/10 = 12 cm to the base height of the plant.b. The height of the parent plant 1 Genotype of the parent plant 1 – D1D1D2D2D3D3d4d4d5d5 The height of the parent plant 2 Genotype of the parent plant 2 – d1d1d2d2d3d3D4D4D5D5Contributing alleles – D4D4D5D5. The height of the plant without any contributing alleles would be 80 cm. The plant with genotype d1d1d2d2d3d3D4D4D5D5 has 4 contributing allele each of which contributes 12 cm to the base. Hence, the height of the plant with genotype d1d1d2d2d3d3D4D4D5D5 would be 80 + 12 + 12 + 12 + 12 = 128 cm. c. Parents – D1D1D2D2D3D3d4d4d5d5 × d1d1d2d2d3d3D4D4D5D5 Gametes – D1D2D3d4d5 × d1d2d3D4D5 F1 generation – D1d1D2d2D3d3D4d4D5d5 The height of the plants of F1 generation = 80 + 12 + 12 + 12 + 12 + 12 = 140 cm Hence, Genotype of the F1 = D1d1D2d2D3d3D4d4D5d5 Phenotype of…
- For questions 1-3, consider a pea plant homozygous for tall stems and green seeds crossed with a plant dihybrid for tall stems and yellow seeds. ✓1. Determine the dimensions (minimum number of boxes) of the Punnett square needed to predict the likely outcome of this mating. O4x4 O 1x4 O 2x2 O1X5 ✓2. Determine the likelihood that this mating will generate progeny that exhibit tall stems. O 100% ● 50% 75% O25% ●0% 9 Cshows the results of a dihybrid cross involving seed shape and seed color. a. What proportion of the round and yellow F2 progeny from this cross is homozygous at both loci? b. What proportion of the round and yellow F2 progeny from this cross is homozygous at least at one locus?A dihybrid cross is one in which two traits with two pairs of genes are studied at once. For example, we cross tall plants with round seeds (TTRR) with dwarf plants and wrinkled seeds. What is the expected phenotypic ratio of the F2 generation? O 3:1 9:3:3:1 O1:1 12 :1
- D D 1 2 d In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with a heterozygous genotype? O 1 only O 1, 2, and 3 2 and 3 2, 3, and 4 4) 3.A dihybrid cross between a homozygous dominant for two traits (YYGG) is crossed with a homozygous recessive for two traits (yygg). A. What percentage of the offspring would be YyGg in the F1 generation? B. What is the expected phenotypic ratio of the F2 generation?Complete the Punnett square showing a cross between a pea plant with round seeds (RR) and a pea plant with oval seeds (rr). Which statement about the offspring is true? O Half of the offspring will have round seeds. O None of the offspring will have round seeds. O There is a 100% chance that the offspring will have oval seeds. O There is a 0% chance that the offspring will have oval seeds.
- For the cross: PpAa x PpAa P = purple flowers (Dominant) p = white flowers A = axial flowers (Dominant) a = terminal flowers a. What are the possible gamete classes that can form from these parents? b. What are the expected offspring genotype classes and ratios/proportions/fractions which will result from the cross? c. What are the expected offspring phenotype classes and ratios/proportions/fractions which will result from the cross? 2. Predict ratios/proportions/fractions of genotypes and phenotypes of the following crosses. T = tall stem t = dwarf stem P = purple flowers p = white flowers G = green pods g = yellow pods A = axial flowers a = terminal flowers R = round peas r = wrinkled seeds A. ttPp x Ttpp B. GgRr x ggRr C. PpGg x ppggQuestion 7/28 A tall pea plant is crossed with a short pea plant. All of the offspring that are produced are tall. Two of these tall offspring are crossed. The Punnett square for this second cross is shown below. TT 25% Tt 25% Tt 25% tt 25% What can be concluded from this cross? Tall pea plants can only produce tall offspring. B Tall pea plants can only produce short offspring.Leaf color and stem length in a certain species of diploid flowers are controlled separately by the R and S locus. The R allele (dominant) results in red leaves while r results in yellow leaves. S (dominant) results in short stems and s results in long stems. A cross is performed between a true breeding long-stemmed red plant and a true breeding short- stemmed yellow plant. a. What is the genotype and phenotype of the resulting F1 plants? b. The resulting F1 plants are crossed with long-stemmed plants with yellow leaves. 100 offspring are collected from this cross, and the following phenotype counts are observed. phenotype long red short red count 43 8 long yellow short yellow 40 What are the corresponding genotypes for each of the four classes of the offspring from this cross? c. Using the information above, determine the genotype of the gametes contributed by "parent A" to each of the resulting offspring. Label the gamete types as parental or nonparental.