In a field you find three types of the same plant: some with long leaves, some with short leaves, and some of intermediate length. What would you suspect to be the genotypes of each? You measure hundreds of plants and find that about half have leaves of intermediate length, whereas one fourth have long leaves and one fourth have short leaves. Does this support your estimate of the genotypes? What kinds of crosses would you do to test it further?

In a field you find three types of the same plant: some with long leaves, some with short leaves, and some of intermediate length. What would you suspect to be the genotypes of each? You measure hundreds of plants and find that about half have leaves of intermediate length, whereas one fourth have long leaves and one fourth have short leaves. Does this support your estimate of the genotypes? What kinds of crosses would you do to test it further?

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Description: In a field you find three types of the same plant: some with long leaves, some with short leaves, and some of intermediate length. What would you suspect to be the genotypes of each? You measure hundreds of plants and find that about half have leaves

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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Imagine you are crossing two plants that have these two genotypes—Tt and tt. What are the two genotypes of the gametes that the Tt plant can make? What is the one genotype of the gametes that the tt plant can make? Set up a Punnett square to analyze the cross. Does the Punnett square need to have four boxes or just two? If you were crossing a TT plant with a tt plant, how many boxes would be necessary in a Punnett square?
The best way to determine the genotype for a plant presenting with dominant phenotypes is by performing a test cross. Test crosses are always performed with a true-breeding plant with recessive traits. What would be the phenotype and genotype of the plant you would need to perform the test-cross with your tall, purple plant?After performing the test-cross with your unknown purple, tall plant you find that all your resulting plants are tall; half have white flowers, and half have purple flowers. What was the genotype of your original purple, tall plant?
Consider three yellow, round peas, labeled A, B, and C. Each was grown into a plant and crossed to a plant grown from a green, wrinkled pea. Exactly 100 peas derived from each cross were sorted into phenotypic classes as follows: A: 51 yellow, round 49 green, round B: 100 yellow, round C: 24 yellow, round 26 yellow, wrinkled 25 green, round 25 green, wrinkled What are the genotypes of plants A, B, and C? (Use gene symbols of your own choosing; be sure to define each one.)
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Most of the individuals of a certain wildflower population have yellow flowers, although a few are white-flowered. Crosses have demonstrated that allele for yellow flower (Y) is dominant over the allele for white (y). Give the genotype of a white-flowered plant. Show your solution.
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