Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 19, Problem 8SQ
Summary Introduction
Introduction: The allele is the variant of the gene. The allele can be dominant or recessive. The dominant allele is the one that will be expressed in the heterozygous condition where two different alleles of the same gene are present. Phenotypic ratio refers to the ratio of the number of organisms in the generation that would express several
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in cattle, “short spine” is lethal shortly after birth; it is caused by the homozygous recessive genotype, ss. Heterozygotes are normal.
What is the phenotypic ratio produced by the cross at after birth?
a. 3:0
b.3:1
c. 1:2:1
d.all alike
You cross individuals with genotypes AABb and AaBb. What is the probability of producing an offspring of type AABb
Group of answer choices
A. 1/2
B. 1/4
C. 1/8
D. 1/16
Assuming complete dominance, a cross between dihybrid F1 pea plants produces F2 phenotype ratios of____ . a. 1:2:1 b. 3:1 c. 1:1:1:1 d. 9:3:3:1
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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- Cystic fibrosis is a recessive Mendelian disorder. An individual must have two copies of the recessive allele (c) to have the disease. If two heterozygous carriers (Cc) mate, what proportion of their offspring will have cystic fibrosis? a. 0% b. 25% c. 50% d. 75% e. 100%arrow_forwardA long-haired cat is crossed to a short-haired cat, both from purebreeding lines. All of the resulting offspring have short hair What types of offspring would result if you crossed one of the offspring to the long-haired parent? Group of answer choices A. all short B. ¼ short ¾ long C. half short and half long D. all long E. ¾ short, ¼ longarrow_forwarda cross between AaBb and aaBb should give what phenotypic ratio? A. 7:1 B. 15:1 C. 3:1 D. 1:1 E. B and Darrow_forward
- In mating between two individuals that are heterozygous for a recessive allele, what genotypic ratio would you expect in the offspring? homozygous dominant: heterozygous: homozygous recessive? A. 1:2:1 B. 3:1:1 C. 1:2:0 D. 0:2:1 E. 1:4:2arrow_forwardRed-green color blindness is caused by a recessive allele on the X chromosome. A color blind woman and her normal vision husband have a color blind son. If they have a daughter what is the probability that the daughter will be color blind? Group of answer choices A. 50% B. 25% C. 100% D. 75% E. 0arrow_forwardA woman is a carrier for the color-blindness gene, found on the X chromosome. She does not have color blindness, however. What are the chances that her female child will also inherit this gene? a. no chance (0%) b. 1 in 4 chance (25%) c. 2 in 4 chance (50%) d. 100% chancearrow_forward
- A test cross is performed to determine if a specific individual is a carrier. The results generate a 50/50 ratio of phenotypes. The test subject is therefore ________. A. Unable to reproduce B. Homozygous recessive C. Not following the rules of Mendelian genetics D. Homozygous dominant E. Heterozygousarrow_forwardUse the product rule to determine the chance of obtaining an offspringwith the genotype Rr Yy from a dihybrid cross between parents withthe genotype Rr Yy.a. ½ c. 1/4b. ¼ d. 1⁄16arrow_forwardGive only typing answer with explanation and conclusionarrow_forward
- A woman with blood type AB marries a man with blood type B. They have a child of blood type A. What is the probability that their next child will have blood type o? Group of answer choices A. 50% B. 75% C. 25% D. 0arrow_forwardTwo blue ferrets were crossed and the outcome was ⅔ blue offspring and ⅓ that were pink. If you crossed two pink ferrets, what percentage of the offspring would be pink? A.25% B.33% C.66% D.75% E.100%arrow_forwardLabrador retrievers’ fur color is controlled by two alleles, E and B. Any dog with the ee__ genotype develops into a yellow lab, while B_E_ dogs become black labs and bbE_ dogs become chocolate labs. This is an example of _____. a. epistasis b. codominance c. incomplete dominance d. linkagearrow_forward
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