Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 5P
Describe the difference between continuous
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a. What is a complex trait? How many genes do we expect to affect a complex trait?
b. How linkage (and linkage disequilibrium) relates to a GWAS?
Name:
Human Phenotypes
Simple dominance inheritance pattern:
Q: How many phenotypes are evident in patterns of simple dominance? What are they?
If a phenotype results from simple dominance, which two genotypes cannot be
distinguished?
Which phenotype is always representative of the genotype?
Now determine your personal inheritance of the following traits. As you read through
the following descriptions, you'll identify your trait, and determine your phenotype.
Your trait will be one of the two
Shape of the face.
Most facial characteristics are affected by many different genes acting together
(multiple factors or polygenic inheritance). For this trait we have simplified the nature
of this trait by assuming it is the result of a single gene. Oval shape is dominant (needs
only
homozygous (both alleles are the same, either dominant or recessive) or heterozygous
(one dominant allele and one recessive allele). Square shape is recessive (requires that
both alleles are the recessive allele in…
Describe how interactions and associations between genotypeand environmental factors may affect phenotypic variance.
Chapter 21 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
Ch. 21 - Which of the following traits would you expect to...Ch. 21 - 19.2 For the traits listed in the previous...Ch. 21 - Compare and contrast broad sense heritability and...Ch. 21 - 19.4 In a cross of two pure-breeding lines of...Ch. 21 - 19.5 Describe the difference between continuous...Ch. 21 - Prob. 6PCh. 21 - 19.7 Provide a definition and an example for each...Ch. 21 - 19.10 Three pairs of genes with two alleles each (...Ch. 21 - Prob. 9PCh. 21 - 19.12 Two inbred lines of sunflowers produce...
Ch. 21 - Prob. 11PCh. 21 - 19.14 In Nicotiana, two inbred strains produce...Ch. 21 - 19.15 Suppose the length of maize ears has narrow...Ch. 21 - In a line of cherry tomatoes, the average fruit...Ch. 21 - 19.17 Two purebreeding wheat strains, one...Ch. 21 - Prob. 16PCh. 21 - During a visit with your grandparents, they...Ch. 21 - 19.20 An association of racehorse owners is...Ch. 21 - Prob. 19PCh. 21 - Suppose a polygenic system for producing color in...Ch. 21 - New Zealand lamb breeders measure the following...Ch. 21 - Cattle breeders would like to improve the protein...Ch. 21 - In human gestational development, abnormalities of...Ch. 21 - The children of couples in which one partner has...Ch. 21 - Answer the following in regard to multifactorial...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- explain how polygenic inheritance and environmental influences combine to produce nearly continuous variation in many phenotypes?arrow_forwardConsider a discrete character with three distinct phenotypes (dark blue hair, light blue hair, or white hair) controlled by two alleles (B and b) at a single locus. If two copies of the B allele are required for an individual to have dark blue hair, and one copy of the B allele produces light blue hair, what is the most likely underlying inheritance mechanism: Co-dominance Incomplete dominance Simple dominance Blending inheritance Blending dominancearrow_forwardWhat is sickle cell anemia? What is the true inheritance pattern? How did scientists discover the true inheritance pattern? Explain multiple Alleles using Human Blood Groups as an example. Demonstrate the understanding of Polygenic Inheritance using an Example. (Skin colour or Height can be used as an example for explanation) . What is heterozygous advantage? Provide an example to explain the process.arrow_forward
- Explain how a comparison of concordance in monozygotic and dizygotic twins can be used to determine the extent to which the expression of a trait is influenced by genes or by environmental factors.arrow_forwardUse Punnett Square:The letter that accompanies each trait is representative of the dominant allele. This is the letter you will use when recording the genotypic information for each trait.Read through the descriptions of each trait and determine which phenotype you express. Record your phenotypeNext, determine your genotype. If you express the dominant phenotype, you cannot determine the second allele you carry, so you must list the two possible genotypes. Record this. Question: Widow’s Peak (W): A hairline that forms a downward point in the middle of the forehead is caused by a dominant allele. A smooth hairline is caused by a recessive genotype.arrow_forwardUse Punnett Square:The letter that accompanies each trait is representative of the dominant allele. This is the letter you will use when recording the genotypic information for each trait.Read through the descriptions of each trait and determine which phenotype you express. Record your phenotypeNext, determine your genotype. If you express the dominant phenotype, you cannot determine the second allele you carry, so you must list the two possible genotypes. Record this. Question: Eye color (B): Inheritance of eye color is controlled by multiple genes, but people having the homozygous recessive genotype have blue eyes. People who have a dominant allele may have different shades of brown, hazel, or green eyes.arrow_forward
- Fill out the 3 generation pedigree chart below wherein the third generation male has blood type B and Hanging Earlobe, the Father has blood type B and Hanging Earlobe while Mother has Blood type B and Attached Earlobe. Include assumptions for the first generation grandparents and second generation children. What is a possible analysis regarding the mode of inheritance of the observed traits ?arrow_forwardSome heterozygotes express a phenotype that is intermediate between the dominant and recessive phenotype. For example, in 4 o’clock flowers the gene for red pigmentation is dominant and the gene for white pigmentation is recessive. However, heterozygotes are pink. The dominant allele does not completely mask expression of the recessive allele: it is incompletely dominant. a. By observing flower color in 4 o’clock flowers, is it possible to unambiguously determine the genotype? YES/NO. Explain your answer. b. Is the same true for flower color in snow peas? YES/NO Why or why not?arrow_forwardIn domestic chicken, feather colour and shape are two traits which are controlled by autosomal alleles that are co-dominant. Table 2 shows the alleles and phenotype of both traits. The heterozygous state for feather colour is grey while the heterozygous state for feather shape is mildly frizzled. TABLE 2 Trait Allele Effect Feather colour CB Produces black feathers in homozygotes CW Produces white feathers in homozygotes Feather shape SS Produces straight feathers in homozygotes SF Produces frizzled feathers in homozygotes (a)A farmer bred a black frizzled rooster with a grey mildly frizzled hen. Draw a genetic diagram to show the expected results of this cross. Include in your answer the phenotypic ratios. (b)Is it necessary to do a test cross to determine the genotypes of the offspring? Explain your answer. (c)The farmer would like all his chickens grey and mildly…arrow_forward
- Fill out the 3 generation pedigree chart below wherein the third generation male has hanging earlobe, the Father has hanging earlobe and Mother has Attached Earlobe. Include assumptions for the first generation grandparents and second generation children. What is a possible analysis regarding the mode of inheritance of the observed traits? Include explanations for inherited characterisitcs and shadingsarrow_forwardIncomplete Dominance and Codominance So far, we have been studying the inheritance of genes that show complete dominance. In other words, one allele is completely dominant over another. In some cases, such as incomplete dominance and codominance, one allele is not completely dominant over another or the alleles affect the phenotype equally. Examples of incomplete dominance include feather color in parrots (C*C* = blue, C'C = yellow, C*Cf = green) and hair texture in humans CC = curly; C'C' = straight; CC' = wavy Practice Problem 3: За. If a straight-haired man marries a curly haired woman, what are the predicted genotypes and phenotypes of their children? If a parrot with yellow feathers is crossed with a parrot with green feathers, what are the predicted genotypes and phenotypes of their offspring? 3b.arrow_forwardHow do we know that threshold traits are actually polygenic even though they may have as few as two discrete phenotypic classes?arrow_forward
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