Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 11, Problem 4TYU
Individuals of genotype AaBb were crossed with aabb individuals. Approximately equal numbers of the following classes of offspring were produced: AaBb, Aabb, aaBb, and aabb. These results illustrate Mendel’s principle(s) of (a) linkage (b) independent assortment (c) segregation (d) a and c (e) b and c
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In a dihybrid cross of two bi-allelic Mendelian genes, A (two alleles – completely dominant A and recessive a), and B (two alleles – completely dominant B and recessive b), such that the parental generation comprises of pure-bred homozygotes (i.e. AABB with aabb), what are the expected genotype and phenotype ratios in the F1 and F2, if the F1 cross is (a) an intercross and if the F1 cross is (b) a testcross
Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed with each other and the following progeny were produced: 320 gray and 80 white. (a) What is the most probable genotype of each parent? (b) Based on your answer in (a) above, what genotypic and phenotypic ratios are expected in the progeny?
Q6. Guinea pigs, which were homozygous for long, black hair were crossed with ones which
were homozygous for short, white hair. All the F1 offspring had short, black hair.
(a) Using suitable symbols, draw a genetic diagram showing parents genotypes, to explain
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(b) Complete the Punnett square to show the results of interbreeding the F1 offspring.
Gametes
Chapter 11 Solutions
Biology (MindTap Course List)
Ch. 11.1 - Define the terms phenotype, genotype, locus,...Ch. 11.1 - Describe Mendels principles of segregation and...Ch. 11.1 - Distinguish among monohybrid, dihybrid, and test...Ch. 11.1 - Explain Mendels principles of segregation and...Ch. 11.1 - What is the maximum number of different alleles...Ch. 11.1 - Can Mendels principle of segregation be...Ch. 11.1 - Prob. 3CCh. 11.2 - PREDICT Use the rules of probability to answer the...Ch. 11.2 - In answering the previous question, did you use...Ch. 11.3 - Define linkage and relate it to specific events in...
Ch. 11.3 - Show how data from a two-point test cross can be...Ch. 11.3 - Discuss the genetic determination of sex and the...Ch. 11.3 - What ratio of genotypes to phenotypes is observed...Ch. 11.3 - Prob. 2CCh. 11.3 - CONNECT Two loci exhibit 5% recombination between...Ch. 11.3 - Which chromosome determines the male sex in humans...Ch. 11.3 - Prob. 5CCh. 11.4 - Explain some of the ways genes may interact to...Ch. 11.4 - Distinguish among incomplete dominance,...Ch. 11.4 - Prob. 11LOCh. 11.4 - Prob. 1CCh. 11.4 - What is the difference between multiple alleles...Ch. 11.4 - Prob. 3CCh. 11.4 - Prob. 4CCh. 11 - One of the autosomal loci controlling eye color in...Ch. 11 - The F1 flies described in question 1 were mated...Ch. 11 - The type of cross described in question 2 is (a)...Ch. 11 - Individuals of genotype AaBb were crossed with...Ch. 11 - Assume that the ratio of females to males is 1:1....Ch. 11 - Redgreen color blindness is an X-linked recessive...Ch. 11 - When two long-winged flies were mated, the...Ch. 11 - The long hair of Persian cats is recessive to the...Ch. 11 - Mr. and Mrs. Smith are concerned because their own...Ch. 11 - A walnut comb rooster is mated to three hens. Hen...Ch. 11 - Individuals of genotype AaBb were mated to...Ch. 11 - Genes A and B are 6 map units apart, and A and C...Ch. 11 - VISUALIZE Sketch a series of diagrams showing each...Ch. 11 - Can you always ascertain an organisms genotype for...Ch. 11 - CONNECT Compare the mechanisms of genetic...Ch. 11 - EVOLUTION LINK Darwins theory of evolution by...Ch. 11 - INTERPRET DATA Using the graph in Figure 11-20,...
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- In Mendel’s pea plants, axial (A) flowers are dominant over terminal (a) flowers. a. What is the genotype of a homozygus axial parent plant? b. What is the genotype of a homozygous terminal parent plant? If the parents in (a) and (b) are crossed, what is the genotype and phenotype of the F1? c. Genotype: d. Phenotype: If the F1s are selfed, determine the following: e. F2 genotypes ____________________ __________________________________________ ______________________f. F2 Phenotypes ____________________ __________________________________________ ______________________g. What is the F2 genotypic ratio? h. What is the F2 phenotypic ratio?arrow_forward1) A cross is made between two plants differing in four independently-assorting gene loci, AABBCCDD x aabbccdd, to produce an F, which is then self-fertilized. If the capital letters represent alleles with a completely dominant phenotypic effect, (a) how many different genotypes are possible in the F;? (b) what proportion of the F; will be homozygous dominant for all genes? (c) what proportion of the F; would have an ABCD phenotype? 2) Would your answers to (a), (b), and (c) be different if the initial cross were AAbbCCdd x aaBBccDD?arrow_forwardA dihybrid heterozygous tall & yellow pea plant was crossed with double recessive plant.(i) What type of cross is this?(ii) Work out the genotype & phenotype of progeny(iii) What principle of Mendel is illustrated through result of this cross?arrow_forward
- Mendel crossed pea plants that produced round seeds with those that produced wrinkled seeds. From a total of 7324 F2 seeds, 5474 were round and 1850 were wrinkled. Using the symbols W and w for genes, (a) symbolize the original P cross; (b) the gametes; and (c) F1 progeny, (d) Represent cross between two F1 plants (or one selfed); (e) symbolize the gametes; and (f) summarize the expected F2 results under the headings: phenotypes, genotypes, genotypic frequency, and phenotypic ratio.arrow_forwardIn one of Mendel’s dihybrid crosses, he observed315 round, yellow; 108 round, green; 101 wrinkled,yellow; and 32 wrinkled, green F2 plants. Analyze thesedata using the x2 test to see if(a) they fit a 9:3:3:1 ratio.(b) the round:wrinkled data fit a 3:1 ratio.(c) the yellow:green data fit a 3:1 ratio.arrow_forwardIn Mendels breeding experiment on garden pea, the offspring of F2 generation are obtained in the ratio of 25% pure yellow pod, 50% hybrid green pods and 25% green pods State (i) which pod colour is dominant (ii) The Phenotypes of the individuals of F1generation. (iii) Workout the cross.arrow_forward
- Assume that a cross is made between a heterozygous tall pea plant and a homozygous short pea plant. Fifty offspring are produced in the following frequency: 32 = tall; 18 = short (a) What frequency of tall and short plants is expected? (b) Compute a Chi-square value associated with the appropriate test of significance. (c) How should this result be interpreted regarding the null hypothesis?arrow_forwardWhich of the following probabilities is correct (according to Mendel's law of independent assortment) regarding a mating of an Ss RR individual to an individual who is Ss Rr? (A – indicates the second allele is either dominant or recessive. A) Homozygous recessive: 10% B) Heterozygous both alleles: 50% C) ss R– : 15.5% D) S– RR: 37.5%arrow_forwardRough coat (R) is dominant over smooth coat (r) in guinea pigs, and black coat (B) is dominant over white (b). This pair of contrasting traits obeys both of Mendel’s laws. If a homozygous rough black is mated with a homozygous smooth white, give the appearance of each of the following: F1; F2; offspring of F1 mated with smooth, white parent; offspring of F1mated with rough, black parent.arrow_forward
- In summer squash, white fruit color (W) is dominant over yellow fruit color (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). If a squash plant true-breeding for white, but heterozygous for disk-shape fruit is crossed with a plant which is a dominant carrier for white, but homozygous sphere-shaped fruit. Following Mendel’s laws of heredity, what could be the phenotypic and genotypic proportion of the WwDD in the the first filial generation? a. wDD (heterozygous white with homozygous disk-shaped fruit) is 1% b. WwDD (heterozygous white with homozygous disk-shaped fruit) is 0 % c. WwDD (homozyzygous white with homozygous disk-shaped fruit) is 6.5% d. WwDD (heterozygous white with homozygous disk-shaped fruit) is 12.5 %arrow_forwardTrying to understand the inheritance of the dominant yellow gene in mice, researchers mated two yellow heterozygous mice. A typical result was 56 yellow progeny to 31 wild-type.(a) Use a chi-square test to determine if the outcome of this cross is consistent with the usual 3:1 ratiopredicted by Mendelian inheritance for a dominant gene.arrow_forwardA dihybrid heterozygous round, yellow seeded garden pea (Pisum sativum) was crossed with a double recessive plant.(i) What type of cross is this?(ii) Work out the genotype and phenotype of the progeny.(iii) What principle of Mendel is illustrated through the result of this cross?arrow_forward
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