EBK BIOLOGY
10th Edition
ISBN: 8220100474729
Author: Martin
Publisher: Cengage Learning US
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Chapter 19.4, Problem 1C
Summary Introduction
To explain: Heterozygote advantage in sickle cell allele.
Introduction: Balanced polymorphism is a type of genetic polymorphism caused by persistence of two or more allele in population over generations. In Balanced polymorphism, the
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Assume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus.
a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes?
b) What is the probability of the parental aabbRR genotype in the F2 progeny?
c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?
What feature(s) of this pedigree indicate(s) dominant inheritance?
Mendelian ratios are modified in crosses involving autotetraploids.Assume that one plant expresses the dominant trait greenseeds and is homozygous (WWWW). This plant is crossed to onewith white seeds that is also homozygous (wwww). If only onedominant allele is sufficient to produce green seeds, predict theF1 and F2 results of such a cross. Assume that synapsis betweenchromosome pairs is random during meiosis.
Chapter 19 Solutions
EBK BIOLOGY
Ch. 19.1 - Define what is meant by a populations gene pool.Ch. 19.1 - Distinguish among genotype, phenotype, and allele...Ch. 19.1 - Prob. 1CCh. 19.1 - Can the frequencies of all genotypes in a...Ch. 19.1 - INTERPRET DATA In a human population of 1000, 840...Ch. 19.2 - Discuss the significance of the HardyWeinberg...Ch. 19.2 - Prob. 4LOCh. 19.2 - INTERPRET DATA In a population at genetic...Ch. 19.2 - INTERPRET DATA In a population at genetic...Ch. 19.2 - INTERPRET DATA The genotype frequencies of a...
Ch. 19.3 - Prob. 5LOCh. 19.3 - Discuss how each of the following...Ch. 19.3 - Distinguish among stabilizing selection,...Ch. 19.3 - Which microevolutionary force leads to adaptive...Ch. 19.3 - Why is mutation important to evolution if it is...Ch. 19.3 - Which microevolutionary forces are most associated...Ch. 19.3 - Prob. 4CCh. 19.4 - Prob. 8LOCh. 19.4 - Prob. 1CCh. 19.4 - Prob. 2CCh. 19.4 - How can researchers test the hypothesis that...Ch. 19 - The genetic description of an individual is its...Ch. 19 - In a diploid species, each individual possesses...Ch. 19 - The MN blood group is of interest to population...Ch. 19 - If a populations allele and genotype frequencies...Ch. 19 - Prob. 5TYUCh. 19 - The continued presence of the allele that causes...Ch. 19 - According to the HardyWeinberg principle, (a)...Ch. 19 - Prob. 8TYUCh. 19 - Mutation (a) leads to adaptive evolutionary change...Ch. 19 - Which of the following is not true of natural...Ch. 19 - If all copies of a given locus have the same...Ch. 19 - Prob. 12TYUCh. 19 - EVOLUTION LINK Given that mutations are almost...Ch. 19 - Prob. 14TYUCh. 19 - Prob. 15TYUCh. 19 - EVOLUTION LINK Evolution is sometimes...Ch. 19 - INTERPRET DATA The recessive allele that causes...Ch. 19 - PREDICT You study males in populations of a...Ch. 19 - Prob. 19TYU
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- Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?arrow_forwardMendelian Genetics Punnett Square Question : In cattle, the hornless condition (H) is dominant to that for the possession of horns (h). a) A horned bull is mated to a hornless cow which is heterozygous . What kind of offspring are to be expected and in what ratio ? b) If the cow is then mated to a hornless bull which is also heterozygous, what is the chance that the first calf will have horns ? c) Assuming that the first calf has horns, what is the chance that the second calf will be hornless ?arrow_forwardTo what do the four pairs of class sizes (very big, two intermediates, very small) correspond?arrow_forward
- With the same setting as the previous problem, in a cross between two BbCc parents, given that an offspring has black coat color and straight fur, what's the probability that it is heterozygous for both genes? Give 2 digits past the decimals.arrow_forwardIn jellyfish, let's say that long tentacles are produced by a sex-influenced allele that is dominant in males and recessive in females. Let B1 = long and B2 = short. Which of the following correctly diagrams a cross between a female with long tentacles and a male with short tentacles? O B1B1XX X B1B2XY O B1B2 XX X B1B2 XY O females with long tentacles do not exist, so this cross is impossible O B1B1 XX X B2B2 XY O X(B1) X(B2) x X(B2) Yarrow_forward. In Figure 2-17, how does the 3:1 ratio in the bottom-lefthand grid differ from the 3:1 ratios obtained by Mendel?arrow_forward
- What are Hypomorphic alleles?arrow_forwardWhat gamete must be donated by the father monster, and what is its probability? a) g l — 12.5% b) g l — 25% c) g l — 75% d) g l — 37.5%arrow_forwardIn Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P1 individuals are homozygous, work the following crosses through the F2 generation, and determine the genotypic and phenotypic ratios for each generation. (a) gray, long * ebony, vestigial (b) gray, vestigial * ebony, long (c) gray, long * gray, vestigialarrow_forward
- In humans, six fingers (F) is dominant to five fingers (f). Assume both parents are heterozygous for six fingers.d) What is the probability of them having six-fingered children? Five fingered children?arrow_forwardWhy is the answer 30 AB/ab; 20 Ab/ab; 20 aB/ab; 30 ab/ab? How do I find that answer and is there a formula I am supposed to use?arrow_forwardMendel's concept of dominance states that in a genotype where two different alleles of a locus are present, only the trait encoded by the dominant allele is observed. Give a molecular explanation for dominance, i.e. explain intracellular molecular events that can result in what we observe as dominance on a phenotypic level. Use the gene that encodes seed shape in peas as an example, where roun(R) is dominant over wrinkled(r), to explain how RR and Rr plants can have the same phenotype.arrow_forward
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