3. If the a and b loci are 40 cM apart and an AA BB individual and an aa bb individual mate:a. What gametes will the F1 individuals produce, andin what proportions? What phenotypic classes inwhat proportions are expected in the F2 generation(assuming complete dominance for both genes)?b. If the original cross was AA bb × aa BB, whatgametic proportions would emerge from the F1?What would be the result in the F2 generation?

3. If the a and b loci are 40 cM apart and an AA BB individual and an aa bb individual mate:a. What gametes will the F1 individuals produce, andin what proportions? What phenotypic classes inwhat proportions are expected in the F2 generation(assuming complete dominance for both genes)?b. If the original cross was AA bb × aa BB, whatgametic proportions would emerge from the F1?What would be the result in the F2 generation?

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Description: 3. If the a and b loci are 40 cM apart and an AA BB individual and an aa bb individual mate:a. What gametes will the F1 individuals produce, andin what proportions? What phenotypic classes inwhat proportions are expected in the F2 generation(assuming

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 1TYK: The dominant C allele of a gene that controls color in corn produces kernels with color; plants...

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Two pairs of traits are segregating in a cross. Two parents produce 156 progeny that fall into 4 phenotypes. The numbers of offspring in the 4 phenotypes are 89, 31, 28, and 8. What are the genotypes of the two parents?
In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?
1. Most of the individuals of a certain wildflower population have white flowers, although a few are purple-flowered. Crosses have demonstrated that allele for white color flower (W) is dominant over the allele for purple (w). a. Give the genotype of a purple-flowered plant, and show the gametes that it would produce as a result of meiosis. b. If two heterozygous whoite-flowered plants are crossed. What fraction of the offspring do you expect to be purple? c. If two purple-flowered plants are crossed, what fraction of their offspring do you expect to be white? 2. In one study, Gregor Mendel crossed yellow-seeded, tall garden pea with a green-seeded, short garden pea. The F1 offspring were all yellow-seeded and tall. Assuming independent assortment of these two genes, what phenotypes and proportions did he fin among F2 offspring when the F1 garden peas are allowed to fertilize themselves? 3. Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either…
3. You perform a cross between two true-breedingstrains of zucchini. One has green fruit and the otherhas yellow fruit. The F1 plants are all green, butwhen these are crossed, the F2 plants consist of9 green : 7 yellow.a. Explain this result. What were the genotypes of thetwo parental strains?b. Indicate the phenotypes, with frequencies, of theprogeny of a testcross of the F1 plants.c. Describe the epistasis interactions observed.d. Suppose that the dominant alleles specify functional enzymes, and the recessive alleles are nonfunctional. Propose a biochemical pathway thatcould explain the gene interactions.e. Is it possible to cross two different pure-breedingyellow zucchini strains and obtain all green progeny? What would be the genotypes of the parentsand progeny? f. Assuming that wild-type zucchini are green, howwould you describe the phenomenon that occurredin the F1 of part (e)?
3) A. How are the following proteins involved in cell division: condensing, cohesin, kinetochore complex, tubulin? B. Why does phenotype not always reveal genotype? C. How can Mendel's postulates of segregation and independent assortment be explained by meiosis? D. Explain the genotypic and phenotypic ratios predicted when performing a monohybrid and a dihybrid cross of heterozygotes? E. How can you use the product rule and sum rule to calculate the probability of a particular genotype resulting from crossing parents of specific genotypes?
6. A heterozygous purple plant is crossed with a white plant. A. Write the genotype of the purple and white plants. B. Write the gametes formed by the purple plant and proportions in which they occur. C. Write the gametes formed by the white plant and proportions in which they occur. D. Combine the gametes using a Punnett square. E. Write the genotypes of the offspring and the ratio in which they occur. F. Write the phenotypes of the offspring and the ratio in which they occur.
1.What are the phenotypes of the parents of the corn dihybrid cross described above? 2. What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? 3.What is the phenotype of the F1 generation of the corn dihybrid cross described above?
1. How many different types of gametes can be produced by an individual with the genotype Yy Ww Pp ee Bb? 2. If an individual with the genotype Yy Ww Pp ee Bb is crossed with another individual with the same genotype, what proportion of offspring will be homozygous recessive at all genes? 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci?
1. In a test cross, a homozygous recessive parent (mm) and a homozygous dominant parent (MM) are crossed. What is the genotypic probability of the offspring? * a. 100% Mm b. 100% mm c. 50% Mm and 50% mm d. 75% Mm and 25% mm e. 50% dominant and 50% recessive f. 100% dominant 2. After performing an experiment on monohybrid cross about the shape of the pea seeds, data were obtained from the result. There are 87 wrinkled pea seeds and 313 round seeds. Of course, round seed is dominant over wrinkled seed. What is the expected value or ratio for the wrinkled seed? * a. 21.75 b. 65.25 c. 100 d. 300 e. 400 f. None of the choices 3.After performing an experiment on monohybrid cross about the shape of the pea seeds, data were obtained from the result. There are 87 wrinkled pea seeds and 313 round seeds. Of course, round seed is dominant over wrinkled seed. What will be the computed chi-square value? * a. 9.75 b. 5.25 c. 4.75 d. 3.00 e. 2.26 f. 2.25 g. 1.69 h. 0.56 i. None of the choices 4.…
1. In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated?
7. In guinea pigs, black hair colour (B) is dominant and brown hair colour (b) is recessive. Long hair (L) is dominant and short hair (l) is recessive. Answer the following questions: (a) Diagram the cross: BbLl x BbLL (b) What are the phenotypes of the parent generation? (c) What are the genotypes and phenotypes of the F1 generation?
1. Take two coins and assume that heads represent the dominantallele (A) and tails represents the recessive allele (a). The genotype for each coin isheterozygous (Aa).2. Assume that each coin represents one parent. When a single coin is flipped, one gameteis formed (through the process of meiosis). If the flipped coin is on heads, then thegamete has the dominant allele (A). When both coins are flipped simultaneously, therewill be two possible gametes that can combine through fertilization to form a zygote. Eachtime you flip both coins, you will record the “genotype” of the offspring.3. Flip the coins 100 times and record your results in the chart below 4. Interpret the data in your tableConclusion: