Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 19, Problem 11CT
You decide to breed a pair of guinea pigs, one black and one white. In guinea pigs, black fur is caused by a dominant allele (B) and white is due to homozygosity for a recessive allele (b) at the same locus. Your guinea pigs have seven offspring, four black and three white. What are the genotypes of the parents? Why is there a 1:1 ratio in this cross?
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A breeder performed a testcross to find out if his male dog was a purebred black. He got one brown puppy and seven black puppies, did he have the purebred? (explain) What was the genotype of the female dog he used in test cross (BB), (Bb), or (bb)? (explain)
If you did an experimental cross and got 1152 individual offspring, how many of those offspring would have to be yellow to have a 3:1 (Yellow: green) ratio from the cross?
Brown fur vs white fur. Say that the alleles for fur color (brown or white) are written using the letter “B” and “b”. The dominant trait is brown, white fur color represents the recessive trait.
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Chapter 19 Solutions
Human Biology (MindTap Course List)
Ch. 19 - Define the difference between (a) gene and allele,...Ch. 19 - Prob. 2RQCh. 19 - What is probability, and how is it applied in...Ch. 19 - What is independent assortment? Does independent...Ch. 19 - Alleles are ___________. a. alternate forms of a...Ch. 19 - A heterozygote has _____. a. only one of the...Ch. 19 - Prob. 3SQCh. 19 - Offspring of a cross AA aa are ______. a. all AA...Ch. 19 - Prob. 5SQCh. 19 - Prob. 6SQ
Ch. 19 - Which statement best fits the principle of...Ch. 19 - Prob. 8SQCh. 19 - Prob. 9SQCh. 19 - Prob. 10SQCh. 19 - One gene has alleles A and a. Another has alleles...Ch. 19 - Still referring to Problem 1, what will be the...Ch. 19 - Go back to Problem 1, and assume you now study a...Ch. 19 - The young woman shown at right has albinismvery...Ch. 19 - When you decide to breed your Labrador retriever...Ch. 19 - The ABO blood system has been used to settle cases...Ch. 19 - Prob. 7CTCh. 19 - A man is homozygous dominant for ten different...Ch. 19 - Prob. 9CTCh. 19 - Bill and Marie each have flat feet, long...Ch. 19 - You decide to breed a pair of guinea pigs, one...
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- The pedigree below represents which individuals in a given family have attached earlobes. Unattached earlobes are dominant over attached earlobes.Which of the following statements is true of the pedigree? a Individuals 8 and 9 are heterozygous for the trait. b Individuals 1, 2, 3, and 4 have attached earlobes. c Individuals 6, 7, and 10 are male. d Individuals 11 and 12 are identical twinsarrow_forwardIn a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive. If a test-cross is performed and 1000 plants are coiunted, approximately how many plants will have white flowers?arrow_forwardBrown fur vs white fur. Say that the alleles for fur color (brown or white) are written using the letter “B” and “b”. The dominant trait is brown, white fur color represents the recessive trait. If you crossed two homozygous recessive individuals for fur color, what would be the chances of having an offspring with the white phenotype?arrow_forward
- A dog breeder liked yellow and brown Labrador retrievers. In an attempt to produce yellow and brown puppies, he mated a yellow Labrador male and a brown Labrador female. Unfortunately, all the puppies produced in this cross were black. Q. How might the breeder go about producing yellow and brown Labradors?.arrow_forwardIn tomatoes, red fruit is dominant to yellow fruit, and purple stems are dominant to green stems. The progeny from one mating consisted of 305 red fruit, purple stem plants; 328 red fruit, green stem plants; 110 yellow fruit, purple stem plants; and 97 yellow fruit, green stem plants. What were the genotypes of the parents in this cross? Explain how you arrived at your answers.arrow_forwardIn a cross, Aa Bb Cc Dd Ee x Aa Bb cc Dd ee, what proportion of offspring are expected to be homozygous recessive for all five genes? show your work.arrow_forward
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- . Which of the following terms is used to describe the offspring of a cross of two true-breeding parents that differ in one or more traits? A) Hybrid B) Pure line C) Homozygous D) Reciprocalarrow_forwardIn guineapigs, an allele for rough fur (R) is dominant over an allele for smooth fur (r); an allele for black coat (B) is dominant over that for white (b). You have an animal with rough, black fur. What cross would you use to determine whether the animal is homozygous for these traits? What phenotype would you expect the offspring if the animal is homozygous?arrow_forwardA black guinea pig is mated to a white guinea pig, and they produce 12 black offspring Then, the same white guinea pig is mated to a different black guinea pig, and they produce 7 black and 5 white offspring. What is the best explanation for the difference between these two matings? In your answer, you must include genotypes for the parents and offspring of each cross.arrow_forward
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