7. A and B are linked genes. In a study of 100 offspring, 96 inherited chromosomes that did not crossover while 4 offspring inherited recombinant chromosomes (chromosomes produced by crossing over ). How far apart are the A and the B genes? (a) 4 map units (b) 6 map units (c) 9.4 map units (d) 94 map units (e) none of the above 8. If two genes are located on different chromosome types then (a) the mother's genotype will determine the phenotype of the son (b) the genes will not be inherited independently (c) parents that are heterozygous for both genes will produce children displaying a 9:3:3:1 ratio (d) one gene will mask or hide the effect of the other (e) none of the above 9. Some people with neurofibromatosis develop blemishes on their skin, while others are severely disfigured. Neurofibromatosis is an example of a gene that (a) is codominant (b) varies in its expressivity (c) is incompletely penetrate (d) is incompletely dominant (e) is linked 10. In the Four Qslock plant when red plants (RR) are crossed to white plants(rr), pink plants are produced. If a pink plant is crossed to a white plant, what fraction of the offspring will be pink? (a) 0 (b) 25% (c) 50% (d) 75% (e) none of the above

7. A and B are linked genes. In a study of 100 offspring, 96 inherited chromosomes that did not crossover while 4 offspring inherited recombinant chromosomes (chromosomes produced by crossing over ). How far apart are the A and the B genes? (a) 4 map units (b) 6 map units (c) 9.4 map units (d) 94 map units (e) none of the above 8. If two genes are located on different chromosome types then (a) the mother's genotype will determine the phenotype of the son (b) the genes will not be inherited independently (c) parents that are heterozygous for both genes will produce children displaying a 9:3:3:1 ratio (d) one gene will mask or hide the effect of the other (e) none of the above 9. Some people with neurofibromatosis develop blemishes on their skin, while others are severely disfigured. Neurofibromatosis is an example of a gene that (a) is codominant (b) varies in its expressivity (c) is incompletely penetrate (d) is incompletely dominant (e) is linked 10. In the Four Qslock plant when red plants (RR) are crossed to white plants(rr), pink plants are produced. If a pink plant is crossed to a white plant, what fraction of the offspring will be pink? (a) 0 (b) 25% (c) 50% (d) 75% (e) none of the above

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

Chapter13: Genes, Chromosomes, And Human Genetics

Section: Chapter Questions

Problem 8TYK: Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene...

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In peas, the allele Le produces tall plants and the allele le produces dwarf plants. The Le allele is dominant to le. If a tall plant is crossed with a dwarf, the offspring are distributed about equally between tall and dwarf plants. What are the genotypes of the parents?
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1. In pea plants, purple flower color is dominant over white flower color. If you had a purple flowered plant, its genotype could be either PP or _______? A. Pp B. pp C. PP 2. To figure out which genotype your purple plant had, you could do a test cross and mate it with a __________ plant? A. White Flower B. Purple Flower 3. If any of the offspring were white, that would tell you that your mystery purple plant had the genotype __________? A. Pp B. PP C. pp
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1. In Drosophila melanogaster (fruit fly) experiment, if we are going to cross male and female red-eyed fruit flies, we have the resulting offspring ratio of 50% red-eyed for female, 25 % for red-eyed male and 25% for white-eyed male. Females which are either homozygous or heterozygous for a trait still expressed eye redness whereas males can easily be affected. Why is this so? a. Females are the carriers of a gene for eye redness b. Y chromosome is responsible for red eyes in fruit flies, c. The gene for eye redness is an X-link dominant trait, d. Having a red-eyed trait is dominantly expressed by females