Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 4, Problem 7EQ
Duroc Jersey pigs are typically red, but a sandy variation is also seen. When two different varieties of true-breeding sandy pigs were crossed to each other, they produced
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Coat color in mice is influenced by two genes, one for color (A) and one for the amount of pigment production (C). Mice with the wild type agouti coat color have a yellowish to brownish color. Mice also have a gene that determines the amount of pigment the hair produces.
Multiple crosses were made between male and female mice that were each heterozygous for both traits (AaCc). The data table shows the number of mice of each coat type. Calculate the average F1 generation coat color to answer the question.
Which of the following is the most probable interaction between the two genetic loci, A and C, based on the average F1 ratio results?
A - The two loci show an epistatic pattern with the loci C epistatic to loci A.B - The two loci show a codominant pattern with both loci affecting coat color.C - The two loci interact in a Mendelian pattern with A being completely dominant over C.D - The two loci show an incomplete dominance pattern with neither loci A nor C being dominant.
Duroc Jersey pigs are typically red, but a sandy variation is also seen. When two different varieties of true-breeding sandy pigs were crossed to each other, they produced F1 offspring that were red. When these F1 offspring were crossed to each other, they produced red, sandy, and white pigs in a 9:6:1 ratio. Explain this pattern of inheritance in terms of number of genes, and any allele or gene interactions.
In the Mexican hairless breed of dog, the lack of hair corresponds to the H/h genotype. Normal dogs
(with hair) are homozygous h/h for the recessive allele. Puppies H/H are stillborn and they display
severe muzzle abnormalities and a lack of inner ear.
a) Which crosses can give hairless dogs at the next generation ?
b) Which one gives the highest frequency of hairless dog for a breeder (only viable animals will
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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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- In oats, the color of the chaff is determined by a two-gene interaction. When a true-breeding black chaff plant was crossed to a truebreeding white chaff plant, the F1 generation was composed of allblack chaff plants. When the F1 offspring were crossed to eachother, the ratio produced was 12 black to 3 gray to 1 white. First,construct a Punnett square that accounts for this pattern of inheritance. Which genotypes produce the gray chaff phenotype? Second,at the level of protein function, how would you explain this type ofinheritance?arrow_forwardA homozygous strain of corn that produces yellow kernels is crossed with another homozygous strain that produces purple kernels. When the F1 are interbred, 197 of the F2 are yellow and 153 are prurple. Give the genotypes of the yellow and purple F2 and propose a genetic model that explains the inheritance of these kernel colors in corn.arrow_forwardJ.W. McKay crossed a stock (true-breeding) melon plant that produced tan seeds with a plant that only produced red seeds and obtained the following results (J.W. McKay. 1936. Journal of Heredity 27:110-112). Cross F1 F2 Tan x red 13 tan 93 tan, 24 red a) Explain the inheritance of tan seeds and red seeds in this plant. b) Assign symbols for the alleles in this cross and draw out the Punnett Squares for the initial cross and the F1 cross.arrow_forward
- In rats, hair color is either gray (G), black (g), or white. The white color is produced due to an epistatic recessive allele of gene "a". In other words, in order for the black or gray color to show up, the rat must have at least one dominant (A) epistatic allele. Two heterozygous Gray rats are crossed. Both rats are also heterozygous for the epistatic gene. Predict the probability that an offspring of this cross will: phenotype *Be sure to express each answer as a percentage! 12pt v a. Express the gray phenotype b. Express the black phenotype c. Express the white O English Paragraph BI U Αarrow_forwardIn rats, hair color is either gray (G), black (g), or white. The white color is produced due to an epistatic recessive allele of gene "a". In other words, in order for the black or gray color to show up, the rat must have at least one dominant (A) epistatic allele. Two heterozygous Gray rats are crossed. Both rats are also heterozygous for the epistatic gene. Predict the probability that an offspring of this cross will: a. Express the gray phenotype b. Express the black phenotype c. Express the white phenotypearrow_forwardDuroc Jersey pigs are typically red, but a sandy variation is alsoseen. When two different varieties of true-breeding sandy pigswere crossed to each other, they produced F1 offspring that werered. When these F1 offspring were crossed to each other, they produced red, sandy, and white pigs in a 9:6:1 ratio. Explain this pattern of inheritance.arrow_forward
- In poultry , the genotype-phenotype relationship for comb shape are R/-P/-, walnut. R/-p/p rose, r/rP/-,pea and r/r/p/p single.what will be the following crosses? a)A rose rose crossed with a walnut produces offspring that are walnut ,rose,pea and single. b)A rose crossed with a pea produces five walnut and six rose offspring. c) A walnut crossed with a walnut produces one rose two walnut and one single offspring.arrow_forwardIn an attempt to breed winter barley that is resistant to barley mosaic virus, agricultural researchers cross a susceptible domesticated strain with a resistant wild strain. The F1 plants are all susceptible, but when the F1 plants are crossed with each other, some of the F2 individuals are resistant. Is the resistance allele recessive or dominant? (Note: susceptible means able to get the viral disease, while resistant means not able to get the disease) A) The resistance allele must be recessive B) The resistance allele must be dominantarrow_forwardIn a population of rabbits, you find three differentcoat color phenotypes: chinchilla (C), himalaya (H),and albino (A). To understand the inheritance of coatcolors, you cross individual rabbits with each otherand note the results in the following table.Cross number Parental phenotypes Phenotypes of progeny1 H × H 3/4 H : 1/4 A2 H × A 1/2 H : 1/2 A3 C × C 3/4 C : 1/4 H4 C × H all C5 C × C 3/4 C : 1/4 A6 H × A all H7 C × A 1/2 C : 1/2 A8 A × A all A9 C × H 1/2 C : 1/2 H10 C × H 1/2 C : 1/4 H : 1/4 Aa. What can you conclude about the inheritance ofcoat color in this population of rabbits?b. Ascribe genotypes to the parents in each of the10 crosses.c. What kinds of progeny would you expect, and inwhat proportions, if you crossed the chinchilla parents in crosses 9 and 10?arrow_forward
- In a particular lizard species, green skin (G) is dominant to blue skin (g). You decide to cross a lizard (Parent #1) that is homozygous recessive for skin color with a lizard (Parent #2) that is homozygous dominant for skin color. Set up a Punnett Square for this cross and then answer the following questions. What is the genotype of Parent #1? [Choose ] What is the phenotype of Parent #1? [Choose ] What is the gentype of Parent #2? [Choose ] What is the phenotype of Parent #2? [ Choose ] What percentage of the offspring will have [Choose ] blue skin? What percentage of the offspring will have [ Choose ] green skin? > > > > >arrow_forwardTwo gray mice with unknown ancestry are crossed. Can you determine from the phenotype of their offspring if the parents are homozygous or heterozygous? Explain how?arrow_forwardIn goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females. We’ll use the symbol Bb for the beard allele and B+ for the beardless allele. Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w). Give the phenotypes and their expected proportions for the following crosses. a. B+ Bb Ww male × B+ Bb Ww female b. B+ Bb Ww male × B+ Bb ww female c. B+ B+ Ww male × Bb Bb Ww female d. B+ Bb Ww male × Bb Bb ww femalearrow_forward
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