Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 13, Problem 8SQ
Summary Introduction
Concept 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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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…
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
Chapter 13 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 13 - A heterozygous individual has a _______ for a...Ch. 13 - An organisms observable traits constitute its...Ch. 13 - Prob. 3SQCh. 13 - The second-generation offspring of a cross between...Ch. 13 - Prob. 5SQCh. 13 - Refer to question 5. Assuming complete dominance,...Ch. 13 - Prob. 7SQCh. 13 - Prob. 8SQCh. 13 - The probability of a crossover occurring between...Ch. 13 - True or false? All traits are inherited in a...
Ch. 13 - Prob. 11SQCh. 13 - The phenotype of individuals heterozygous for...Ch. 13 - Prob. 13SQCh. 13 - Match the terms with the best description. ______...Ch. 13 - Assuming that independent assortment occurs during...Ch. 13 - Refer to problem 2. Determine the predicted...Ch. 13 - Refer to problem 2. Assume a third gene has...Ch. 13 - Prob. 4GPCh. 13 - Suppose you identify a new gene in mice. One of...Ch. 13 - Mendel crossed a true-breeding pea plant with...Ch. 13 - Several alleles affect traits of roses, such as...Ch. 13 - Prob. 1DAACh. 13 - Prob. 2DAACh. 13 - Prob. 3DAACh. 13 - Mutations in the TYR gene may render its enzyme...Ch. 13 - In sweet pea plants, an allele for purple flowers....Ch. 13 - Red-flowering snapdragons are homozygous for...Ch. 13 - A single allele gives rise to the Hbs form of...
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- In 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_forwardAssuming 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_forwardAssuming complete dominance, crosses between two dihybrid F1 pea plant, which are offspring from a cross AABBaabb, result in F2 phenotype ratios of ________. a. 1:2:1 b. 3:1 c. 1:1:1:1 d. 9:3:3:1arrow_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_forwardIn incomplete dominance, one alle is not fully dominant over another, so the heterozygous phenotype is _______. A. an intermediate blend between the two homozygous phenotypes B. the same as homozygous recessive phenotype C. the same as the homozygous dominant phenotypearrow_forwardA 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_forward
- Refer 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_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_forwardA testcross is a way to determine_______ . a. phenotype b. genotype c. dominancearrow_forward
- One gene that affects three traits is an example of______ . a. dominance c. pleiotropy b. codominance d. epistasisarrow_forwardYellow Dominant pea Seed with unknown genotype (YY or Yy) is test-crossed with green homozygous recessive pea seed (yy). After the test cross, the genotype of yellow dominant seed is Yy. What was the result of Cross that confirmed the genotype as Yy? a. All green seeds b. 50% yellow and 50% green seeds (½ : ½). c. All yellow seeds d. 75% yellow and 25% green seeds (3:1)arrow_forwardTwo summer white squashes with genotype WwYy were crossed (W= white color, Y=yellow color, w and y= green color) W is epistatic to Y and y. What would be the different colors of summer squashes obtained out of the above cross? (2 pts.) A. 12 white: 3 yellow:1 green B. 12 yellow: 3 white: 1 green C. 12 green: 1 white: 3 yellow D. 12 yellow: 3 green: 1 whitearrow_forward
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