Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 4.2, Problem 2COMQ
Summary Introduction
Introduction:
In genetics, the relation between two alleles in a single gene results in overexpression of one allele. This allele is known as dominant and the other allele is called recessive. A dominant allele can code for the protein function whereas a recessive allele does not code for protein or for expressing the traits.
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Chapter 4 Solutions
Genetics: Analysis and Principles
Ch. 4.1 - 1. Which of the following statements is true?
a....Ch. 4.2 - 1. Which of the following is not an example of a...Ch. 4.2 - Prob. 2COMQCh. 4.2 - 3. Polydactyly is a condition in which a person...Ch. 4.3 - The outcome of an individuals traits is controlled...Ch. 4.4 - Prob. 1COMQCh. 4.4 - Prob. 2COMQCh. 4.5 - Prob. 1COMQCh. 4.5 - Hemophilia is a blood-clotting disorder in humans...Ch. 4.6 - Prob. 1COMQ
Ch. 4.7 - 1. The Manx phenotype in cats is caused by a...Ch. 4.8 - Which of the following is a possible explanation...Ch. 4.9 - 1. Two different strains of sweet peas are...Ch. 4.9 - If the F1 offspring from question 1 are allowed to...Ch. 4 - 1. Describe the differences among dominance,...Ch. 4 - Discuss the differences among sex-influenced,...Ch. 4 - 3. What is meant by a gene interaction? How can a...Ch. 4 - Lets suppose a recessive allele encodes a...Ch. 4 - 5. A nectarine is a peach without the fuzz. The...Ch. 4 - 6. An allele in Drosophila produces a star-eye...Ch. 4 - A seed dealer wants to sell four-oclock seeds that...Ch. 4 - 8. The blood serum from one individual (let’s call...Ch. 4 - 9. Which blood type phenotypes (A, B, AB, and/or...Ch. 4 - A woman with type B blood has a child with type O...Ch. 4 - A type A woman is the daughter of a type O father...Ch. 4 - In Shorthorn cattle, coat color is controlled by a...Ch. 4 - In chickens, the Leghorn variety has white...Ch. 4 - Propose the most likely mode of inheritance...Ch. 4 - 15. A human disease known as vitamin D-resistant...Ch. 4 - 16. Hemophilia is an X-linked recessive trait in...Ch. 4 - 17. Incontinentia pigmenti, a rare, X-linked...Ch. 4 - 18. Scurs in cattle is a sex-influenced trait. A...Ch. 4 - In rabbits, the color of body fat is controlled by...Ch. 4 - Prob. 20CONQCh. 4 - 21. The trait of feathering in fowls is a...Ch. 4 - Based on the pedigree shown here for a trait...Ch. 4 - 23. The pedigree shown here involves a trait...Ch. 4 - Lets suppose you have pedigree data from thousands...Ch. 4 - Prob. 25CONQCh. 4 - 26. In humans, a very rare dominant allele that...Ch. 4 - 27. A sex-influenced trait in humans affects the...Ch. 4 - Three coat-color patterns that occur in some...Ch. 4 - Prob. 1EQCh. 4 - 2. In chickens, some varieties have feathered...Ch. 4 - 3. In sheep, the formation of horns is a...Ch. 4 - Prob. 4EQCh. 4 - In the clover butterfly, males are always yellow,...Ch. 4 - The Mic2 gene in humans is present on both the X...Ch. 4 - 7. Duroc Jersey pigs are typically red, but a...Ch. 4 - 8. As shown in Figure 4.17, coat color in rodents...Ch. 4 - 9. Summer squash exist in long, spherical, or disk...Ch. 4 - In a species of plant, two genes control flower...Ch. 4 - 11. Red eyes is the wild-type phenotype in...Ch. 4 - 12. As mentioned in Experimental Question E11, red...Ch. 4 - Lets suppose you were looking through a vial of...Ch. 4 - 14. When examining a human pedigree, what features...Ch. 4 - Lets suppose a gene exists as a functional...Ch. 4 - In oats, the color of the chaff is determined by a...
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- A person’s blood type is the result of expression of a gene with three alleles. However, only 2 alleles are expressed in any cell. This gene determines what type of sugar molecule gets added to the red blood cell membrane. The alleles for this gene are codominant. Together, this means that: a. only one allele is expressed and the other two are not expressed b. two alleles are expressed, and both are dominant c. if you took 10 single red blood cells from 1 person and looked at them, 1/3 would show 1 type of sugar molecule, 1/3 would have the 2nd sugar molecule, and 1/3 would have no sugar molecules on the surface d. All of the above are truearrow_forwardWhich of the following is a possible explanation for pleiotropy?a. The expression of a single gene can affect cell function in morethan one way.b. A gene may be expressed in different cell types in a multicellularorganism.c. A gene may be expressed at different stages of development.d. All of the above are possible explanations.arrow_forwardThe two genes are, the likely they are to be inherited together. A. farther, more B. more, more C. closer, less D. closer, morearrow_forward
- Karyotypes can be used to: Map an individual's chromosomes Il. Determine genetic mutations Ill. Determine chromosomal abnormalities Directly treat abnormalities a.1, 11, IV b.1, 111 c. 1, 11 d. 11, 111 e. 1, 11, 111, IVarrow_forwardDefine ‘gene’. What is an allele and loss-of-function alleles? What do these alleles tell us about normal gene function?arrow_forwardWhich of the following scenarios best describes an epistatic gene? Select one: a. Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene. b. Chicken combs follow a dominance hierarchy whereby a walnut comb is the most dominant and a single comb is the least dominant. c. Individuals with sickle cell anemia and carriers of the sickle cell allele have some resistance to malaria. d. Mouse fur colours are expressed as a blend of the dominant black colour and the recessive white colour, resulting in a heterozygous brown colour.arrow_forward
- The difference between dominant and recessive traits is … Group of answer choices: A.genes for dominant traits are passed on preferentially. B.effects of recessive traits can be hidden by effects of dominant traits. C.recessive traits are deleterious (bad for the organism) and dominant traits are not. D.dominant genes produce proteins, recessive genes do not. E.dominant traits are more likely to be expressed in males.arrow_forwardWhen the phenotype of the offspring is determined by endoparasites in the father it is… a. epistasis b. due to genes located in the mitochondria. c. a maternal effect d. non-nuclear inheritance e. a non-additive genetic effectarrow_forwardCodominance occurs when Select one: A. both of the alleles in a heterozygote are equally expressed phenotypically in an individual. B. offspring exhibit several different phenotypic expressions of a single trait. C. expression of two different alleles alternates from one generation to the next. D. a heterozygote expresses an intermediate phenotype.arrow_forward
- .a. Mutations in gene “X” are responsible for breast cancer and can be inherited into the next progeny. In one such case, one affected male parent (a father) who had only one affected parent (can be either male or female) too came to a genetic counselor. Upon the testing recommended by the counselor, it has been found that that male parent’s child has a 50% risk of developing the cancer. Can you discuss the inheritance pattern of this disease for this male parent? In which Mendelian disorder, all the children of a mother (both of her alleles of a gene on X chromosome are pathogenic) could also be affected?arrow_forwardWhich of the following statements correctly describes a Y-linked trait? A. It will always be expressed if present in female individuals B. It can be inherited by a daughter for her father C. It can be inherited by a son from his mother D. It will always be expressed if present in male individualsarrow_forwardWhen a disease is due to polygenic inheritance, the following is probably true: A. Many factors, both genetic and environmental, contribute to the disease traits. B. It is caused by one gene with a large number of alleles. C. It affects a large number of people. D. It has many different symptomsarrow_forward
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