Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 16.5, Problem 1TYK
Summary Introduction
Introduction:
Incomplete dominance is a genetic condition takes place when the expression of one allele is not able to completely mask the other (recessive) allele. It is an exception to the mendelian law of dominance. The genotypic ratio for incomplete dominance is 1:2:1.
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Three gene pairs located on separate autosomes determine flower color and shape as well as plant height. The first pair exhibits incomplete dominance, where the color can be red, pink (the heterozygote), or white. The second pair leads to personate (dominant) or peloric (recessive) flower shape, while the third gene pair produces either the dominant tall trait or the recessive dwarf trait. Homozygous plants that are red, personate, and tall are crossed to those that are white, peloric, and dwarf. Determine the F1 genotype(s) and phenotype(s). If the F1 plants are interbred, what proportion of the offspring will exhibit the same phenotype as the F1 plants?
Two genes determine flower color and leaf shape. However, these genes do not exhibit complete dominance. Flower color is purple (EE), purple&yellow (Ee), or yellow(ee). Leaf shape is chordate (DD), lobed (Dd), or oval (dd). a. Flower color exhibits what type of dominance ____________________________ and List the phenotype(s) seen in their offspring. Yellow, lobed plants are crossed to purple& yellow, lobed plants.
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Chapter 16 Solutions
Principles of Biology
Ch. 16.1 - Which of the following is an epigenetic change...Ch. 16.2 - If you crossed an Igf 2 Igf 2- male mouse to an...Ch. 16.2 - Prob. 1TYKCh. 16.2 - Prob. 2TYKCh. 16.3 - Prob. 1CCCh. 16.3 - Prob. 1TYKCh. 16.3 - Which of the following statements regarding...Ch. 16.4 - Prob. 1TYKCh. 16.4 - Prob. 2TYKCh. 16.5 - Prob. 1BC
Ch. 16.5 - Prob. 1CCCh. 16.5 - Prob. 1TYKCh. 16.5 - Prob. 2TYKCh. 16.6 - Prob. 1CCCh. 16.6 - Prob. 1BCCh. 16.6 - Prob. 1TYKCh. 16.6 - Genes that are linked do not conform to Mendels...Ch. 16 - Which of the following is an example of an...Ch. 16 - In mice, the allele of the Igf2 gene that is...Ch. 16 - Prob. 3TYCh. 16 - The marking process for genomic imprinting...Ch. 16 - According to Mary Lyons hypothesis, the patchwork...Ch. 16 - Prob. 6TYCh. 16 - Prob. 7TYCh. 16 - Prob. 8TYCh. 16 - Prob. 9TYCh. 16 - Prob. 10TYCh. 16 - Prob. 1CCQCh. 16 - Prob. 2CCQCh. 16 - Prob. 3CCQCh. 16 - Prob. 1CBQCh. 16 - Prob. 2CBQ
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- In four-o'-clock plants, the allele for red flowers is incompletely dominant to the allele for white flowers, so heterozygotes have pink flowers. What ratios of flower colors would you expect among the offspring of white flower plants X pink flower plants.arrow_forwardIn plants like those of Questions 13 and 14, with red, pink, and white flowers, does flower color show complete or incomplete dominance?arrow_forwardSuppose you do a cross between two parents who are both heterozygous for two traits, such as petal shape (narrow or wide, narrow is dominant) and flower color (red or white, red is dominant). If there are 160 offspring, how many would you expect to have wide petals with red flowers?arrow_forward
- What type of fertilization happens when two individuals mate by brushing pollen from one plant onto a female organ of another plant (Mendel used)?arrow_forwardOne strain of periwinkleplants has green leaves and another strain has white leaves. Bothstrains are true-breeding. You do not know if the phenotypicdifference is due to alleles of a nuclear gene or an organellar gene.The two strains were analyzed using reciprocal crosses, and thefollowing results were obtained:A plant with green leaves is pollinated by a plant with whiteleaves: all offspring have green leaves.A plant with white leaves is pollinated by a plant with greenleaves: all offspring have white leaves. Is this pattern of inheritance consistent with simple Mendelianinheritance, where green is dominant to white, and/or is it consistentwith maternal inheritance?arrow_forwardTwo true breeding plants are cross pollinated. One plant is homozygous dominant for heightand color while the other is homozygous recessive for height and color. (A:tall, a:short, B:brown,b:red) The F1 plants are allowed to self-fertilize to produce an F2 generation. After conductingan experiment we get the following results:398 tall and brown plants122 tall and red plants128 short and brown plants45 short and red plants Using the Chi Square formula and table, determine if your results support the hypothesis ofindependent assortment or not. Show your work. You don’t need to show your Punnett Squaresif you include a statement as to how you figured out the appropriate phenotypic ratio for the F2generation. Round to 1 decimal.4a. What possible gametes can the following individual make: AaBb4b. What possible gametes can the following individual make: AaBbCCarrow_forward
- When 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_forwardIn pea plants, purple flower color is dominant to white flower color. If a homozygous dominant flower mates with a white flower, what is the chance of having white-flowered offspring?arrow_forwardA heterozygous plant with genotype Aa self-pollinates. Find the probability that an offspring is tall for the following genetic systems. Heterozygous plants are tall, and homozygous plants are short.arrow_forward
- In the Primula plant, the blue flower color is due to malvidin, a pigment encoded by the completely dominant gene (M). Presence of only the recessive gene (m) leads to white flowers. The P locus controls pigment synthesis in the M locus such that dominant gene (P) stops pigment production, and recessive gene (p) allows pigment production. Two plants both having the MmPp genotype were crossed. What would be the probability of getting plants that are pure-breeding for blue flower color?arrow_forwardIn crosses made among four-o'clock plants, red flower color plants are crossed with white flower color plants. All the offspring show a pink flower color. If a pink-flowered plant is crossed with a red-flowered plant, what will be the phenotypic ratios of their offspring? 1/4 red flowered, 1/4 white flowered, 1/2 pink flowered 1/3 red flowered, 2/3 pink flowered 1/2 red flowered, 1/2 pink flowered 3/4 red flowered, 1/4 pink flowered 1/2 white flowered, 1/2 pink floweredarrow_forwardConsider the following hypothetical gene a plant. Gene T produces a protein that impacts stem length. There are two alleles for gene T, T which produces long stems and t which results in short stems. If gene T displays incomplete dominance, which of the following genotypes above would have a different phenotype? and What would the phenotype be for this genotype?arrow_forward
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