Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 12, Problem 27CTQ
Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the
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Draw a table that shows all possible combinations of offspring resulting from a dihybrid cross of pea plants that are heterozygous for the tall/dwarf and inflated/constricted allele.
Show the cross between a heterozygous purple flowered pea plant and a white flowered pea plant.
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What is the phenotypic ratio of the above cross?
Purple (P) flower color is dominant to white (p) flower color. Cross two heterozygous parents using a Punnett square. What are the genotypes and phenotypes of the resulting offspring? Express the results as ratios.
Chapter 12 Solutions
Biology 2e
Ch. 12 - Figure 12.5 In pea plants, round peas (R) are...Ch. 12 - Figure 12.6 What are the genotypes of the...Ch. 12 - Figure 12.12 What ratio of offspring would result...Ch. 12 - Figure 12.16 In pea plants, purple flowers (P) are...Ch. 12 - Mendel performed hybridizations by transferring...Ch. 12 - Which is one of the seven characteristics that...Ch. 12 - Imagine you are performing a cross involving seed...Ch. 12 - Consider a cross to investigate the pea pod...Ch. 12 - A scientist pollinates a true-breeding pea plant...Ch. 12 - The observable traits expressed by an organism are...
Ch. 12 - A recessive trait will be observed in individuals...Ch. 12 - If black and white true-breeding mice are mated...Ch. 12 - The ABO blood groups in humans are expressed as...Ch. 12 - In a mating between two individuals that are...Ch. 12 - If the allele encoding polydactyly (six fingers)...Ch. 12 - A farmer raises black and white chickens. To his...Ch. 12 - Assuming no gene linkage, in a dihybrid cross of...Ch. 12 - The forked line and probability methods make use...Ch. 12 - How many different offspring genotypes are...Ch. 12 - Labrador retriever's fur color is controlled by...Ch. 12 - Which of the following situations does not follow...Ch. 12 - Describe one of the reasons why the garden pea was...Ch. 12 - How would you perform a reciprocal cross for the...Ch. 12 - Mendel performs a cross using a true-breeding pea...Ch. 12 - Calculate the probability of selecting a heart or...Ch. 12 - The gene for flower position in pea plants exists...Ch. 12 - Use a Punnett square to predict the offspring in a...Ch. 12 - Can a human male be a carrier of red-green color...Ch. 12 - Why is it more efficient to perform a test cross...Ch. 12 - Use the probability method to calculate the...Ch. 12 - Explain epistatis in terms of its Greek-language...Ch. 12 - In Section 12.3, ''Laws of Inheritance," an...Ch. 12 - People with trisomy 21 develop Down’s syndrome....Ch. 12 - A heterozygous pea plant produces violet flowers...
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- Draw the Punnett square for a test cross between a plant that is heterozygous for two traits and aplant that is homozygous recessive at the same two traits. Write down the genotypic and phenotypic ratios.arrow_forwardIn Japanese four o'clock plants red (R) color is incompletely dominant over white (r) flowers, and the heterogynous condition (Rr) results in plants with pink flowers. Construct a punnett square and give phenotypic and genotype ratios of the offspring for the following cross a red plant and a white plantarrow_forwardIf the tobacco plant parents are both heterozygous for color, what are the possible genotypes and phenotypes of their offspring? Complete the Punnett square below. What is the expected phenotypic ratio?arrow_forward
- In snapdragon plants, flower color follows an incomplete dominance inheritance pattern. Homozygous dominant plants have red flowers, heterozygotes have pink flowers, and homozygous recessive plants have white flowers. Complete the following cross and identify what percentage of the offspring are each color. Cross- Homozygous dominant by heterozygous plants what % have red flowers what % have pink flowers what % have white flowersarrow_forwardIf a plant is tall, has round seeds and purple flowers, with the genotype of TTRREE is crossed with a plant that is short and has wrinkle seeds and white flowers with the genotype ttrree. What would be the offspring of their F1 generation and F2 generation like? Form a Punnett square and write the phenotypic ratio?arrow_forwardUse a punnett square in fruit flies, red eyes (r) are dominant to pink eyes (r). what is the phenotypic ratio of a cross between a heterozygous male and a pink-eyed femalearrow_forward
- In snapdragons, red flower color is incompletely dominant over white. Cross 2 heterozygous pink flowers. What is the phenotypic ratio?arrow_forwardA cross is made between a pea plant that has constricted pods (a recessive trait; smooth is dominant) and is heterozygous for seed color (yellow is dominant to green) and a plant that is heterozygous for both pod texture and seed color. Construct a Punnett square that depicts this cross. What are the predicted outcomes of genotypes and phenotypes of the offspring?arrow_forwardThe gene for pea pod colour has two alleles. The dominant allele, G, is associated with the dominant trait of green pea pod colour. The recessive allele, g, is associated with the recessive trait of yellow pea pod colour. Using a Punnett square, show the results of a monohybrid cross where the parent plants are both heterozygous for the trait of pea colour. What is the genotypic ratio of the offspring of this cross?arrow_forward
- 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 :1arrow_forwardRound seeds are dominant to wrinkled seeds in pea plants. Mendel crossed a purebred recessive plant with a hybrid. What are the phenotypic percentages for the expected offspring?arrow_forwardUse the following information about pea plants: S = spherical seeds; s = wrinkled seeds Y = yellow seeds; y = green seeds P = purple flowers; p = white flowers I = inflated pods; i = constricted pods Write the possible genotypes for the following conditions: Heterozygous for spherical seeds Homozygous for wrinkled seeds Homozygous for spherical seeds and heterozygous for flower colorarrow_forward
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