Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 10, Problem 2GP
Summary Introduction
To review:
The mode of inheritance of palomino coloration in the horse.
Introduction:
The palomino horse is usually golden in color but some consider it to be a hybrid breed. The palomino horse was bred with its own kind and the offspring obtained included 65 palominos, 34 chestnut, and 32 cream-colored horses.
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Students have asked these similar questions
Three coat-color patterns that occur in some breeds of horses aretermed cremello (beige), chestnut (brown), and palomino (goldenwith light mane and tail). If two palomino horses are mated, theyproduce about 1/4 cremello, 1/4 chestnut, and 1/2 palomino offspring. In contrast, cremello horses and chestnut horses breed true.(In other words, two cremello horses will produce only cremellooffspring, and two chestnut horses will produce only chestnut offspring.) Explain this pattern of inheritance.
What progeny would result from crossing a homozygous rose-combed hen with a homozygous pea-combed rooster? What phenotypes and ratios would be seen in the F2 progeny?
Palomino horses have a golden yellow coat, chestnut horses have a brown coat and cremello
horses have an almost white coat. A series of crosses between the 3 different types of horses
produced the following offspring:
Offspring
13 Palomino, 6 chestnut, 5 cremello
Cross
Palomino x palomino
Chestnut x chestnut
16 chestnut
Cremello x cremello
13 cremello
Palomino x chestnut
8 palomino, 9 chestnut
11 palomino, 11 cremello
23 palomino
Palomino x cremello
Chestnut x cremello
B)
Assign symbols for the alleles that determine these phenotypes, and list the GENOTYPES of
all the parents and offspring given in the table above.
Chapter 10 Solutions
Biology: Life on Earth
Ch. 10 - Fill-in-the-Blank The physical position of a gene...Ch. 10 - Define nondisjunction, and describe common...Ch. 10 - In certain cattle, hair color can be red...Ch. 10 - Prob. 2GPCh. 10 - In the edible pea, tall (T) is dominant to short...Ch. 10 - In tomatoes, round fruit (R) is dominant to long...Ch. 10 - In the tomatoes of Problem 4, an F1 offspring...Ch. 10 - Prob. 6GPCh. 10 - In humans, one of the genes determining color...Ch. 10 - In the couple described in Problem 7, the woman...
Ch. 10 - An organism is described as Rr, with red coloring....Ch. 10 - 2. The inheritance of multiple traits depends on...Ch. 10 - Fill-in-the-Blank Many organisms, including...Ch. 10 - 4. Genes that are present on one sex chromosome...Ch. 10 - 5. When the phenotype of heterozygotes is...Ch. 10 - 1. Define the following terms: gene, allele,...Ch. 10 - 2. Explain why genes located on the same...Ch. 10 - 3. Define polygenic inheritance. Why does...Ch. 10 - What is sex linkage? In mammals, which sex would...Ch. 10 - What is the difference between a phenotype and a...Ch. 10 - 6. In the pedigree of part (a) of Figure 11–22, do...Ch. 10 - Sometimes the term gene is used rather casually....Ch. 10 - In an alternate universe, all the genes in all...Ch. 10 - Prob. 3AC
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- In roan cattle, red (R) and white (W) are codominant. Heterozygous individuals produce both red and white hairs, known as roan. When two roan cattle are crossed, what are the phenotypic ratios of the offspring?arrow_forwardFor Dalmatian dogs, the spotted condition is dominant over non-spotted. (a) Using a Punnett square, show the results of a cross between two heterozygous parents. ( please draw the punnet square and write the parent and G and f1: thanks) (b) A spotted female Dalmatian dog mates with an unknown father. From the appearance of the pups, the owner concludes that the male was a Dalmatian. The owner notes that the female had six pups, three spotted and three non-spotted. What are the genotype and phenotype of the unknown male?arrow_forwardIn cattle, coats may be solid white, solid black, or black-and-whitespotted. When true-breeding solid whites are mated with truebreeding solid blacks, the F1 generation consists of all solid white individuals. After many F1 * F1 matings, the following ratio was observed in the F2 generation: 12/16 solid white3/16 black-and-white spotted1/16 solid black Explain the mode of inheritance governing coat color by determining how many gene pairs are involved and which genotypes yield which phenotypes. Is it possible to isolate a true-breeding strain of black-and-white spotted cattle? If so, what genotype would they have? If not, explain why not.arrow_forward
- Following the Rule of Non-Mendelian Genetics (Incomplete Dominances), In a genetic cross between one snapdragon flower that is Homozygous (ww) for white petal color and one snapdragon flower that is Hemozygous (WW) for red petal color. What would be the phenotype of the offspring? (Legend: W = red color; w = white colorarrow_forwardIn dogs, black (B) is dominant over brown (b) color. What would be the color of the puppies if a purebred black dog is crossed with a purebred brown dog? What would be the phenotypic ratio of the F1 offspring? Show a punnet square for this crossarrow_forwardIn chickens, rose comb (R) is dominant to single comb (r). What types of offspring would be expected from a white rooster who is heterozygous rose combed who is crossed with a single-combed Andalusian blue hen.arrow_forward
- In horses, there are three coat colour patterns called cremello (beige/light brown), chestnut (brown) andpalomino (golden with a light mane and tail). If two palomino horses are mated, they produce about ¼ cremello,¼ chestnut and ½ palomino offspring. In contrast, cremello and chestnut horses breed true.a. Explain this pattern of inheritance. (Refer to the number of loci controlling the trait, the number of alleles perlocus and the dominance interaction between the alleles).b. Assign genotypes to the phenotypes.arrow_forwardA man has a roan bull and a white cow. His first 5 calves turned to be 2 roans and 3 white. Keeping in mind the fact that the roan is a color obtained when cattle are heterozygous for the gene for red and white, how frequently (probability of the phenotypes) would you expect such as a combination of offspring as that obtained in this case?arrow_forward1) Palomino horses have a golden yellow coat, chestnut horses have a brown coat and cremello horses have an almost white coat. A series of crosses between the 3 different types of horses produced the following offspring: Cross Offspring Palomino x palomino 13 Palomino, 6 chestnut, 5 cremello Chestnut x chestnut 16 chestnut Cremello x cremello 13 cremello Palomino x chestnut 8 palomino, 9 chestnut 11 palomino, 11 cremello 23 palomino Palomino x cremello Chestnut x cremello A) Explain the inheritance of the palomino, chestnut, and cremello phenotypes in horses.arrow_forward
- In certain lizards, scaly skin is dominant to smooth skin and speckled color is dominant to grey color. These traits are inherited according to traditional Mendelian genetics (no linkage). The total progeny for a breeding pair of lizards resulted in the offspring listed below. What are the genotypes of the male and female parents? 102 scaly skinned, speckled off spring 110 smooth skinned, speckled offspring 38 scaly skinned, grey offspring 32 smooth skinned, grey offspringarrow_forwardIf a pure breeding(homozygous) black(dominant), longhaired (recessive) cat is made of pure breeding Siamese, shorthaired cat, and one of their male offspring has made it to one of their female offspring, what is the chance of producing a Siamese colored shorthair kitten?arrow_forwardRabbits with the genotype CC® are black, heterozygous rabbits C°CW appear brown, and rabbits that are CWCW have white fur. What is the phenotypic and genotypic ratio of the offspring of a cross between a brown and a white rabbit?arrow_forward
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