Chapter 12: Q. 33 (page 328)
People with trisomy 21 develop Down’s 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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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 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.
Figure 12.6What are the genotypes of the individuals labeled 1, 2, and 3?
Figure 12.12 What ratio of offspring would result from a cross between a white-eyed male and a female that is heterozygous for red eye color?
In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous: homozygous recessive) would you expect to observe in the offspring?
a. 1:2:1
b. 3:1:1
c. 1:2:0
d. 0:2:1
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