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Chapter 12: Q. 33 (page 328)
People with trisomy 21 develop Down鈥檚 syndrome. What law of Mendelian inheritance is violated in this disease? What is the most likely way this occurs?
Violation of the Law of Segregation
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A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?
a. All the offspring will be speckled.
b. 75% of the offspring will be speckled, and 25% will be black.
c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.
d. 50% of the offspring will be black and 50% of the offspring will be white.
Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?
a. 1:1:1:1
b. 1:3:3:1
c. 1:2:2:1
d. 4:3:2:1
Which of the following situations does not follow the Law of Independent Assortment?
a. A blind man and a brunette woman produce three offspring over time, all of who have blind hair.
b. A white cow crossed with a brown bull produces roan cattle.
c. Mating a hog with a sow produces six female piglets.
d. Men are more likely to experience hemophilia than women.
A heterozygous pea plant produces violet flowers and yellow, round seeds. Describe the expected genotypes of the gametes produced by Mendelian inheritance. If all three genes are found on the same arm of one chromosome should a scientist predict that inheritance patterns will follow Mendelian genetics?
Figure 12.5In pea plants, round peas ( R ) are dominant to wrinkled peas ( r ). You do a test cross between a pea plant with wrinkled peas (genotype rr ) and a plant of unknown genotype that has round peas. You end up with three plants, all of which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?
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