Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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A horticulturist has a purple plant and a white plant. The horticulturist knows that purple is dominant over white. When they are bred, all of the resulting offspring are purple. What is the most likely genotype of the parent or original purple plant?
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- A homozygous purple plant is crossed with a homozygous white plant. Write the cross and offspring in a Punnet square. What is the genotype of phenotype ratios of the first generation (F1)? Gametes: Genotypes: Phenotypes:arrow_forwardA Pea plant with axial flower position, tall stem length, and green seed pod color is cross with another pea plant that has axial flower position, dwarf stem length, and yellow seed pod color. Assume heterozygosity for all dominant trait. What is the genotypic ratio?arrow_forwardIn a plant, stems can appear fuzzy or smooth. The allele for fuzzy (F) is dominant. These plants can also have blue (B-) or white flowers. White is the recessive trait. A cross was made between plants heterozygous for both traits. You observed 290 blue fuzzy, 80 blue smooth, 70 white fuzzy, and 40 white smooth plants. Are your observations consistent with your expectations?arrow_forward
- A Pea plant with axial flower position, tall stem length, and green seed pod color is cross with another pea plant that has axial flower position, dwarf stem length, and yellow seed pod color. Assume heterozygosity for all dominant trait. What is the phenotypic ratio?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 phenotype produced by the following genotypes: PP Pp SS ss SSPp IiPp IIPParrow_forwardIn some plants a red pigment is synthesized from a colorless precursor. The addition of a hydroxyl group to the precursor molecule causes it to become purple. In a cross between two randomly selected purple plants, the following results were obtained. 94 purple 31 red 43 white Q:What are the genotypes of the two random purple plants? R/r; P/p X R/r; P/p R/r; p/p X R/r; p/p r/r; P/p X r/r; P/p r/r; p/p X r/r; p/p R/R; P/P X r/r; p/parrow_forward
- If 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_forwardThe 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?arrow_forwardThe diagram shows a plant that is heterozygous for two genes. G = yellow; g = green; R = round; r = wrinkled G Four different types of gametes are produced by a heterozygous individual when crossing over occurs, and two different types of gametes are produced when crossing over does not occur. What does this information reveal about crossng over? O Crossing over introduces variety by producing different combinations of alleles. O Crossing over reduces the incidence of DNA and chromosomal mutations. O Crossing over introduces variety in by creating types of genes. O Crossing over maintains the count of genes and the original alleles in both chromosomes. Copyright ©2021 Certica Solutions, Inc. https://encase.te21.com/Assessment/View/fc425cee-df10-4f28-a988-c3calbfa788a/675fd7db-03b1-48af-af8e-f6be62227cd7#arrow_forward
- A farmer is interested in a novel colour pattern in beans. This trait is controlled by a single autosomal gene (Gene G) with two alleles. The G-allele results in a striped bean, while the recessive g-allele causes a brown bean. The farmer has a plant that has striped beans. Can you suggest how the farmer can determine the genotype (GG or Gg) of his bean plant in a single cross? Describe this cross and provide details on how you would interpret the resultsarrow_forwardCross a true-breeding plant that produces yellow seeds with a plant that produces green seeds. a) Using the table below, specify the notation that you will use. b) What are the genotypes of the parent plants? c) Draw the Punnett Square for the cross. d) Write the expected genotypic ratio of the potential offspring. e) Write the expected phenotypic ratio of the potential offspring. Character Flower color Flower position Seed color Seed shape Pod shape Pod color Stem length ©2012 Pearson Education, Inc. Dominant Purple Axial Yellow Round Inflated Green Tall Traits Recessive White Terminal Green Wrinkled Constricted Yellow Dwarfarrow_forwardWhen traits show complete dominance, the genotype can be revealed by a test cross. In the example of tall and dwarf plants (Figure) why is it necessary to use the dwarf parent? In general, why is it necessary to use a parent that is homozygous recessive?arrow_forward
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