Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 1LTB
Is a round yellow pea seed (genotype Rr Y y) an example of polygenic inheritance? Why or why not?
Expert Solution & Answer
Summary Introduction
To write:
Whether a yellow colored pea with round shape is an example of polygenic inheritance.
Introduction:
The inheritance in which a polygenic trait is inherited by an organism is called polygenic inheritance. The polygenic trait is a type of trait in which two or more genes control a particular trait. The polygenic traits are different from normal traits as they have multiple genes controlling a particular trait.
Explanation of Solution
The round pea seed with yellow color (genotype RrYy) contains two genes for color and shape. One gene codes for the color and the other codes for the shape. There is no gene that codes for both shape as well as the color. The genes separate during cell division. This is called independent assortment. The gene coding for color separates from the gene coding by the process of independent assortment. This indicates that a pea plant with genotype “RrYy” is not an example of polygenic inheritance.
Conclusion
Therefore, a yellow and round pea seed with genotype “RrYy” is not an example of a polygenic trait. This is because both traits are controlled by different genes and not by a single gene.
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Red-green color blindness is inherited as an X-linked recessive (Xc). If a color-blind man marries a woman who is heterozygous for normal vision, what would be the expected phenotypes of their children with reference to this character? In your answer, specify in your phenotype descriptions the gender of the children. (For example, don’t just say 75% of the children would be colorblind – you would instead say 100 % of the daughters would be colorblind and 50% of the sons would be colorblind. Note that this is not a correct answer; it is just to give you an idea of how to explain the correct phenotypes of the cross.)___
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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,…
What feature(s) of this pedigree indicate(s) recessive inheritance?
Chapter 9 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 9 - Is a round yellow pea seed (genotype Rr Y y) an...Ch. 9 - What factors cause quantitative variation in a...Ch. 9 - The DNA profile below is from a mother, a father,...Ch. 9 - Prob. 4LTBCh. 9 - Prob. 5LTBCh. 9 - Prob. 6LTBCh. 9 - Prob. 7LTBCh. 9 - Prob. 8LTBCh. 9 - Add labels to the figure that follows, which...Ch. 9 - Prob. 10LTB
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- are the gene pairs in non allelic interaaction, recessive epistasis independently segragating?arrow_forwardWhat is the most likely pattern of inheritance for this disorder? (Is it autosomal dominant? Autosomal recessive? X-linked dominant? X-linked recessive? Y-linked? Mitochondrial?) Please include two specific pieces of evidence, present within the pedigree, that indicate that this pattern is most likely, as opposed to any other potential pattern. You may assume that the gene responsible for the trait is fully penetrant.arrow_forwardbased on the pedigree shown，the most likely pattern of inheritance is ？arrow_forward
- In this case a family history revealed a genetic basis for the disorder. The pedigree is shown in Fig. 1 Below. Key Ø Female: affected Female: unaffected || IV V 5600 orize 077808 15 10 9 10 CHO વ Male: affected Male: unaffected Deceased Disease status not given Dizygotic twins Monozygotic twins Fig. 1 Disease pedigree. Five generations I, II, III, IV, V are shown. Females are represented by circles, males by squares, dizygotic (non-identical) twins by diagonal lines originating from the same point, Monozygotic (identical) twins by diagonal lines originating from the same point and joined symbols and deceased by a diagonal line through the symbol. Filled symbols indicate that the individual displays the disease phenotype. Unfilled symbols indicate that the individual does not display the disease phenotype. Carriers of the disease are not indicated. Information on disease status is not known for generation I and is omitted for the individuals represented by a symbol with an asterisk.…arrow_forwardThe following pedigree illustrates the inheritance of a rare neurologicaldisease. What is the most likely mode of inheritance for this disorder?Explain your reasoning.arrow_forwardFor the following problems, please choose from the following modes of inheritance: autosomal dominant, autosomal recessive, X-linked dominant, X-linked recessive 8080 50 OTO ㅁㅇㅇㅁ I. What is the most likely mode of inheritance portrayed in the pedigree above?arrow_forward
- X-linked recessive, carrier mother Unaffected. Carrier mother father X Y XX |Unaffected |Affected I Carrier XY Unaffected Unaffected Carrier daughter Affected son daughter U.S. National Library of Medicine son Color blindedness is a sex-linked trait. If we could see the pedigree chart for several more generations of the family illustrated here, we would expect A) more males to be color blind. B) móre females to be color blind. no females to ever be color blind. D) an equal number of males and females that are color blind.arrow_forwardIn the following pedigree, is the disorder’s mode of inheritanceautosomal dominant, autosomal recessive, or X-linked recessive?Explain your reasoning.arrow_forwardIn a multigenerational study of a family, 8% of the males and 8% of the females have red hair. What may be the cause of this? A)Autosomal inheritance B)Environmental influence C)Sex-linked inheritance D)Non-somatic inheritancearrow_forward
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