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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?

Short Answer

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Violation of the Law of Segregation

Step by step solution

01

Step. 1 Introduction 

Down's syndrome is a condition produced by excess gene located on chromosome 21 because of inappropriate cell division. Trisomy 21 induces Down syndrome in 95 percent of cases, which shows the individual does have three copies of chromosome 21 rather than the standard two copies among all cells. It is a genetic problem. It contains genetic abnormalities, learning difficulties, and facial characteristics defects. A disabled child might have heart conditions as well as sight and hearing troubles.

02

Step. 2 Explanation

A trisomy condition occurs when a patient receives three copies of the chromosome and not the typical pairing. These are a violation to the Segregation law of genetics and happens whenever the chromosomes lack to split throughout the first cycle of meiosis.

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Most popular questions from this chapter

Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the phenotypic ratio of the offspring?

Which is one of the seven characteristics that Mendel observed in pea plants?

a. flower size

b. seed texture

c. leaf shape

d. stem color

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?

The forked line and probability methods make use of what probability rule?

a. test cross

b. product rule

c. monohybrid rule

d. sum rule

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.
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