WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 7, Problem 5MC
Summary Introduction
Introduction:
If a dominant allele is present in an allele pair, it will completely overshadow the recessive allele.
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shows the results of a cross between a tall pea plant and a short pea plant. a. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the short parent? b. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the tall parent?
A tall pea plant with terminal flowers (flowers on the ends of the stems) is crossed with a short plant thathas axial flowers. All 72 offspring are tall with axial flowers. This is a dihybrid cross with the height andflower position traits showing independent assortment.
a. Name the dominant and recessive alleles.
b. Give the genotypes of the parents and offspring in this cross.
c. Predict the F2 offspring when the tall-axial F1's are allowed to self pollinate.
In a simple Mendelian monohybrid cross, true-breeding tall plants are crossed with short plants, and the F1 plants, which are all tall, are allowed to self-pollinate. What fraction of the F2 generation will be both tall and heterozygous?
Select one:
a. 1/8
b. 1/4
c. 1/2
d. 3/4
e. 0
Chapter 7 Solutions
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
Ch. 7 - Prob. 1SACh. 7 - Prob. 2SACh. 7 - Prob. 3SACh. 7 - Prob. 4SACh. 7 - Prob. 5SACh. 7 - Prob. 6SACh. 7 - Prob. 7SACh. 7 - Prob. 8SACh. 7 - Prob. 9SACh. 7 - Prob. 10SA
Ch. 7 - Prob. 11SACh. 7 - Prob. 12SACh. 7 - Prob. 13SACh. 7 - Prob. 14SACh. 7 - Prob. 15SACh. 7 - Prob. 1MCCh. 7 - Prob. 2MCCh. 7 - Prob. 3MCCh. 7 - Prob. 4MCCh. 7 - Prob. 5MCCh. 7 - Prob. 6MCCh. 7 - Prob. 7MCCh. 7 - Prob. 8MCCh. 7 - Prob. 9MCCh. 7 - Prob. 10MCCh. 7 - Prob. 11MCCh. 7 - Prob. 12MCCh. 7 - Prob. 13MCCh. 7 - Prob. 14MCCh. 7 - Prob. 15MCCh. 7 - Prob. 16MC
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- In a plant, green is dominant over white leaf; long is dominant over round shape. a. How many total genotypes are possible in the offsprings of a dihybrid cross? Show the Punnet square. b. Give the phenotypic and genotypic ratios. c. What is the probability of obtaining a plant with white, round shaped leaves?arrow_forwardGive typed explanation : In peas, tall (T) is dominant to short (t). A homozygous tall plant is crossed with a short plant. The F1 are self-fertilized to produce the F2. Both tall and short plants appear in the F2. If the tall F2 are self-fertilized, what types of offspring and proportions will be produced?arrow_forwardIn pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of twoplants that are heterozygous for the seed shape trait,i. Explain the diagram ii. What fraction of the offspring should have spherical seeds? iii. Use punnett square to show your answer. iv. Interpret the results of a Punnett squarearrow_forward
- True breeding eggplant plants producing deep, purple colored fruit are crossed with true breeding plants producing white fruit. The offspring of this cross all produce lighter, violet fruit. The colors of the fruit are produced by the interactions of the two different alleles. A.Predict the genotype of the F1 plant. B. Predict the expected proportions and genotypes in the F2 generation, if F1 eggplants are crossed.arrow_forwardIn a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant? O a. Homozygous dominant: RR O b. Homozygous recessive: rr Oc. Incomplete dominance d. Heterozygous dominant: Rr CLEAR MY CHOICEarrow_forwardGreen color in corn plant is controlled by a pair of genes. Give the genotype and phenotype of the offspring from the following crosses:a. GG x Ggb. Gg x Ggc. Explain why no observes a colorless corn plantarrow_forward
- The weight of a fruit in a certain variety of squash is varies. When a plant that produces 6-lb fruits is crossed with a plant that produces 2-lb fruits, all offspring produce fruits that weigh 4 lbs each. In the F2 offspring, the variation in weight varies by 0.5 lbs from each. a. How many genes are involved? b. What ratio of squash in the F2 would weigh over 4.5 lbs? 4 I 6 I 4 5 [10I 10I 5 ] 6 [15 20 I 15]I 6 ] 1 7 21 35 35 21 7I1 18 28 56] 70 56 28] 8 ] 1 1 I9 [ 36 I 84 I126|126] 84 I 36 I 9 I 1 1 [ 10 45 120 210 252 210 120] 45 10I 1 1 [11 55 165 330 462 462 330 165 55 11 1arrow_forwardHow to solve thisarrow_forwardPetunia flower color is governed by two alleles, but neither allele is truly dominant over the other. Petunias with the genotype RR are red-flowered, those that are heterozygous (RW) are pink, while those with the (WW) genotype have white flowers. This is an example of incomplete dominance. a. If a white-flowered plant is crossed with a red-flowered plant, what is the genotypic ratio of the F1. b. What is the phenotypic ratio of the F1. c. If two of the F1 offspring were crossed, what phenotypes would appear in the F2?. d. What would be the genotypic ratio in the F2 generation?arrow_forward
- In sweet peas, the two allelic pairs (genes) C, c and P, p are known to effect pigment formation in the flowers. The dominants, C&P, are both necessary for colored flowers. Absence of either results in white flowers. A dihybrid plant is crossed to a white one which is heterozygous at the "C" locus. 1. What is the genotype of the dihybrid plant? 2. What is the genotype of the white plant? 3. What kinds of flowers, colored or white, are to be expected from the cross above? Include the ratio. 4. Assume that another gene ,allelic pair, in sweet peas also affects pigment formation in addition to the mentioned in above question. The presence of the dominant, R, is required for red flowers. It's recessive allele, r, genes produces yellow flowers. What would be the phenotypes of the following plants in relation to flower color? 4a. CcPpRr 4b. CcppRR 4c. CcPPrr 4d. CCPPRR Paragraph BIarrow_forwardTallness (T) in a certain plant is dominant to short (t), while red (R) flower color is dominant to yellow (r). The heterozygous condition results in orange (Rr) flower color. A short plant with red flowers, is crossed with a plant homozygous for tallness and yellow flowers. What would be the genotype and phenotype of the F1 individuals? ttRr—short and orange ttrr—short and yellow TtRr—tall and red Ttrr—tall and yellow TtRr—tall and orangearrow_forwardImagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding homozygous parents with green seeds (yy) and yellow seeds (YY)? Yellow seed color (Y) is dominant over green (y). Lütfen birini seçin: a. 25 percent yellow, 75 percent green seeds O b. 50 percent yellow, 50 percent green seeds a. 50 percent yellow, 50 percent green seeds O c. 100 percent yellow seeds O d. 100 percent green seedsarrow_forward
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