Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
4th Edition
ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 9, Problem 11SA
Summary Introduction
To review:
- Mendel's second law.
- Why it doesn't apply for all traits.
Introduction:
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In the results that Mendel obtained, the violet colored flower was dominant to the white flower (which was recessive). What do these terms (dominant and recessive) mean?
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Chapter 9 Solutions
Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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- A pedigree analysis was performed on the family of a man with schizophrenia. Based on the known concordance statistics, would his MZ twin be at high risk for the disease? Would the twins risk decrease if he were raised in an environment different from that of his schizophrenic brother?arrow_forwardHow is heritability related to genetic and environmental variance?arrow_forwardFor Mendelian inheritance, the nuclear genotype (i.e., the allelesfound on chromosomes in the cell nucleus) directly influences anoffspring’s traits. In contrast, for non-Mendelian inheritance patterns, the offspring’s phenotype cannot be reliably predicted solelyfrom its genotype. For the following traits, what do you need toknow to predict the phenotypic outcome?A. Dwarfism due to a mutant Igf2 alleleB. Snail coiling directionC. Leber hereditary optic neuropathyarrow_forward
- For all seven characters described in the data of Mendel allowed the F2 plants to self-fertilize. He found that whenF2 plants with recessive traits were crossed to each other, theyalways bred true. However, when F2 plants with dominant traitswere crossed, some bred true but others did not. A summary ofMendel’s results is shown to the right When considering the data in this table, keep in mind that theydescribe the characteristics of the F2 generation parents that haddisplayed a dominant phenotype. These data were deduced byanalyzing the outcome of the F3 generation. Based on Mendel’slaws, explain why the ratios were approximately 1:2arrow_forwardThis problem examines possible biochemical explanations for variations of Mendel’s 9:3:3:1 ratio. Exceptwhere indicated, compounds 1, 2, 3, and 4 have different colors, as do mixtures of these compounds. Aand B are enzymes that catalyze the indicated steps ofthe pathway. Alleles A and B specify functional enzymes A and B, respectively; these are completelydominant to alleles a and b, which do not specify anyof the corresponding enzyme. If functional enzyme ispresent, assume that the compound to the left of thearrow is converted completely to the compound to theright of the arrow. For each pathway, what phenotypicratios would you expect among the progeny of a dihybrid cross of the form Aa Bb × Aa Bb?a. Independent pathwaysCompound 4Compound 2Compound 3Compound 1Enz AEnz Bb. Redundant pathwaysCompound 1 Compound 2Enz BEnz Ac. Sequential pathwayCompound 1 Compound 2 Compound 3Enz A Enz Bd. Enzymes A and B both needed to catalyze the reaction indicated.Compound 1 Compound 2arrow_forwardWhich of the following statements is true about the molecular basis of Mendel's second law? OThe random attachment of the sister chromatids and the split of them into different daughter cells during the second round of cell division in Meiosis ensure Mendel's second law of independent assortment of alleles. OThe random attachment of the sister chromatids and the split of them into different daughter cells during the first round of cell division in Meiosis ensure Mendel's 2nd law. O The molecular basis of independent assortment of alleles is the segregation of sister chromatids during the second round of cell division in Meiosis. O The molecular basis of independent assortment of alleles is the segregation of homologous chromosomes during the second round of cell division in Meiosis. O The molecular basis of independent assortment of alleles is the segregation of homologous chromosomes during the first round of cell division in Meiosis.arrow_forward
- why doesnt this chi square value fit the number of expected with independent assortment?arrow_forwardWhat is Dominance variance ?arrow_forwardBIU A- == 三E 12 - Match each of the following examples to the appropriate type of non-Mendelian inheritance. 1. A homozygous recessive genotype for the gene that encodes phenylalanine hydroxylase (which breaks down the amino acid phenylalanine) causes lighter skin color, a musty odor, differences in intellectual development, and seizures. 2. In pea plants, alleles of Gene W control flower color, with the dominant allele (W) leading to purple flower.color, and the recessive allele (w) leading to white flower color. Usually, a genotype of WW or Ww leads to purple flowers. However, when Gene C is homozygous recessive, WW or Ww plants always have white flowers. 3. In mallard ducks, feather coloring is controlled by Gene F. A dominant allele (F) leads to green head feathers, while a recessive allele (f) leads to brown head feathers. In male mallards, inheritance of one or more F alleles always leads to the green head feather trait. But female mallards always have brown head feathers,…arrow_forward
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