In sweet pea plant, an allele for purple flowers
296 purple flowers/long pollen grains
19 purple flowers/round pollen grains
27 red flowers/long pollen grains
85 red flowers/round pollen grains
What is the best explanation for these results?
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Chapter 13 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
- A pea plant is heterozygous for both pod shape and color. I is the allele for dominant, inflated pod; i is the allele for recessive, constricted pod. G is the allele for dominant, green pod; g is the allele for recessive, yellow color characteristic. Suppose this plant is crossed with a homozygous pea with inflated, green pod, what will be the possible genotype of the offspring? Identify the: Parents’ genes?Parents’ traits?Genes (genotype)?Shape, color? (phenotype)?Genotypic ratio?Phenotypic ratio?arrow_forwardIn an example of recessive epistasis the deposition of pigment into hair follicles of the Labrador Retriever is governed by a dominant gene (C) and lack of deposition by its recessive allele (c). Lack of pigment deposition produces a yellow coat color. The color of pigment is governed by an independently assorting hypostatic gene, the dominant allele (B) produces black pigment and its recessive allele (b) produces brown. What coat color ratio is expected from the cross of a brown dog (bbCc) to a black dog (BbCc)? 3/8 black, 1/8 brown, 1/2 yellow 3/8 black, 3/8 brown, 1/4 yellow 1/2 brown, 1/2 black 1/2 black, 1/4 brown, 1/4 yellow 1/4 black, 1/4 brown, 1/2 yellowarrow_forwardin a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. when plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. which of the following is true? Red is incompletely dominant Red is recessive Red is dominant Red is codominant Blue is dominantarrow_forward
- A pea plant is heterozygous for both pod shape and color. I is the allele for dominant, inflated pod; i is the allele for recessive, constricted pod. G is the allele for dominant, green pod; g is the allele for recessive, yellow color characteristic. Suppose this plant is crossed with a homozygous pea with inflated, green pod, what will be the possible genotype of the offspring? Construct the punnet square, then identify the following: 1. Parents’ genes?2. Parents’ traits?3. Genes (genotype)?4. Shape, color? (phenotype)?5. Genotypic ratio?6. Phenotypic ratio?arrow_forwardIn Andalusian fowls, black (BB) and white (bb) individuals are homozygous. When a homozygous black bird (BB) is crossed with a homozygous white (bb) bird offspring are all bluish-gray (Bb). Show the cross as well as the genotypes and phenotypes of the parental cross between two heterozygous parents. 1. P1: _________ x _________ 2. Punnett Square: 3. Genotype symbols: 4. Genotype in words: 5. Genotypic ratio: 6. Genotypic %: 7. Phenotype symbols: 8. Phenotype in words: 9. Phenotypic ratio: 10. Phenotypic %:arrow_forwardIn sweet pea plant, an allele for purple flowers(P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes:296 purple flowers/long pollen grains19 purple flowers/round pollen grains27 red flowers/long pollen grains85 red flowers/round pollen grainsWhat is the best explanation for these results?arrow_forward
- Do a punnet square to find the possible genotypes and phenotypes of the F1 generation when a plant that is homozygous recessive for pod color and heterozygous for pea shape is crossed with a plant that is heterozygous for pod color and homozygous dominant for pea shape. Dominant for pod color = G (green) Recessive for pod color = g (yellow) Dominant for pea shape = R (round) Recessive for pea shape = r (wrinkled) P1: GG X Rr Gg X RRarrow_forwardGregor Mendel discovered the basis of heredity with his sweet pea plant experiments. In his studies, he determined that certain traits, such as pod color and pea shape, express complete dominance. Trait Dominant Recessive Pod color Yellow Green Pea shape Round Wrinkled A cross occurs between a plant with heterozygous yellow pods and wrinkled peas and a plant with green pods and heterozygous round peas. What is the probability that the offspring will exhibit recessive genes for both traits? a) 1/2 b) 1/4 c) 1/8 d) 1/16arrow_forwardIn swallowtail butterflies, let's pretend that the R gene codes for coloring on the forewing. The R1 allele, which codes for red color, is dominant to the R2 allele, which codes for white color. If R1 is a recessive lethal allele, what phenotypic ratio would you expect when crossing two swallowtails with red forewings? 1 red : 2 white 1 red : 3 white 3 red : 1 white there is not enough information given to answer this question 1 red : 1 white 2 red : 1 whitearrow_forward
- . An allele A that is not lethal when homozygous causes rats to have yellow coats. The allele R of a separate gene that assorts independently produces a black coat. Together, A and R produce a grayish coat, whereas a and r produce a white coat. A gray male is crossed with a yel-low female, and the F1 is 3 8 yellow, 3 8 gray, 1 8 black, and 1 8 white. Determine the genotypes of the parents.arrow_forwardIn birds, wingspan is determined by two genes, one with complete dominance of one allele over the other, one with additive effects. Birds with genotype aabb has 16 cm long wingspan, whereas those with AABB has 20 cm long wingspan. A cross between AABB and aabb parents produced F1 with 19cm wingspan. Crossing the F1s produced F2 with the following phenotypes (in cm): 20.0 19.6 18.3 20.0 19.1 18.7 18.2 17.3 16.0 19.2 17.8 18.4 19.3 19.5 20.0 19.7 Determine the values of the following: NOTE: write the formula and the final answer Mean of the data Variance of the data Standard deviation According to these data, which wingspans are within one standard deviation of the mean?arrow_forwardThimble foxes cook color is controlled by a single gene while tail length is controlled by a separate Gene. Red coat is dominant to white coat and long tails are dominant to short tails, dominant is complete. Thimble fox one has a red coat and a long tail, its mother had a white coat and short tail. Thimble fox two has a white coat and long tail, its father had a short tail.  Complete the punnets square for this cross and give the phenotypic ratio of the offspring. If there is a dominant allele for this first Street, place the gamete in the first give me a position. Then state the Phenotypic ratio.arrow_forward