Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 19, Problem 6SQ
Summary Introduction
Introduction: An allele is a variant of a 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. The phenotypic ratio refers to the ratio of the number of organisms in the generation that would express several
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Assuming complete dominance, the F1 generation from a monohybrid cross between to parents that are both homozygous (PP x Pp) will always
result in offspring (mark all that apply)
a. in a 1:3:1 ratio
b. with identical phenotype
C. in a 1:2:1 ratio
O d. with identical genotype
The offspring of the cross AA × aa are______ . a. all AA c. all Aa b. all aa d. half are AA and half are aa
Choose the correct answer.
1.What are the phenotypes of the offspring that results from a cross between snapdragon plants that produce red (RR) and pink (Rr) flowers? (Incomplete dominance) *
a. 75% red, 25% pink
b. 50% red, 50% pink
c. 50% red, 25% pink, 25% white
d. 75% pink, 25% red
2. In Dalmatian dogs, the spotted condition (S) is dominant over non-spotted (s). A litter of 8 pups were found—four spotted and four non-spotted. Based on the appearance of the pups, what are the genotypes of the parents? *
a. Ss and Ss
b. SS and ss
c. Ss and ss
d. ss and ss
3.The allele for brown eye (B) is dominant to that of blue eye (b). A brown-eyed man with a blue-eyed mother marries a blue-eyed woman. What is the probability that the first child is blue-eyed? *
a. 25%
b. 75%
c. 50%
d. 100%
4.The gene for green seed coat (G) is dominant to the gene for yellow seed coat (g). A plant with a yellow seed coat is crossed with a plant with a green seed coat. Eight of the offspring had yellow…
Chapter 19 Solutions
Human Biology Custom Edition
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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- Assuming no gene linkage, in a dihybrid cross ofAABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB,Ab, ab) that will give rise to the F2 offspring? a. 1:1:1:1 b. 1:3:3:1 c. 1:2:2:1 d. 4:3:2:1arrow_forwardThe Camelia flower exhibits codominance with flowers being red, white, or white and red spotted. Determine the probability that a red flower crossed with a white and red flower will have a white offspring. O a. 0% O b. 50% O c. 25% O d. 75% e. 100%arrow_forwardIn a parental cross between a true-breeding, homozygous purple-flowered pea plant and a true breeding homozygous white-flowered plant, the F1 generation will A. all be white B. 3: 1 ratio of white to purple C. 3: 1 ratio of purple to white D. all be purplearrow_forward
- A condition in which both alleles of a heterozygous condition are expressed as a blending of traits is ______. a incomplete dominance b sex-linked c transformation d crossing overarrow_forwardThe monohybrid crossing of heterozygous organism is analyzed. Which distribution of progeny genotypes will be: Select one: O a. 3:1 O b. 1:2:1 O C. 1:1 d. 9:3:3:1 O e. 9:7arrow_forwardOne gene that affects three traits is an example of ________. a. dominance c. pleiotropy b. codominance d. epistasisarrow_forward
- In garden pea plants, an inflated pod shape (I) is dominant over a pinched pod (i). The cross between two true breeding inflated pods can be represented by Select one: a. IiIi b. iiii c. IIII d. IIii e. Iiiiarrow_forwardTwo parents without cystic fibrosis have a child with cystic fibrosis. The allele for cystic fibrosis is therefore _________ to the non-disease allele Group of answer choices A. codominant B. recessive C. dominant D. epistatic E. incompletely dominantarrow_forwardRefer to question 5. Assuming complete dominance, the F2 generation will show a phenotypic ratio of______ . a. 3:1 b. 9:1 c. 1:2:1 d. 9:3:3:1arrow_forward
- Question 7/28 A tall pea plant is crossed with a short pea plant. All of the offspring that are produced are tall. Two of these tall offspring are crossed. The Punnett square for this second cross is shown below. TT 25% Tt 25% Tt 25% tt 25% What can be concluded from this cross? Tall pea plants can only produce tall offspring. B Tall pea plants can only produce short offspring.arrow_forwardGive written answer with explanation and conclusionarrow_forwardIf these two individuals with the following characteristics are crossed Parent 1: blood type AB; heterozygous for H gene Parent 2: heterozygous B blood type; hh genotype What is the phenotypic ratio (blood type) of the F, generation? A. 4 AB: 1 A: 1 B: 2 0 B. 2 AB: 2 A: 4 B: no O C. 1 AB: 1 A: 2 B: 4 0 D. 1 AB: 1 A: 1 B: 10arrow_forward
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