AP BIOLOGY

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HEREDITY

CROSSOVER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Mendel observed that some characters did not assort independently. Later researchers found it to be due to
A
Crossing-over
B
Linkage
C
Dominance of one trait over the other
D
Amitosis
Explanation: 

Detailed explanation-1: -So, the correct answer is ‘Linkage’

Detailed explanation-2: -Since the genes were present on different chromosomes, and the ones present on the same chromosome were also situated far apart, he didn’t observe any linkage in the genes.

Detailed explanation-3: -Linked genes are exceptions to the law of independent assortment because two genes are located on the same chromosome, but this is generally mitigated when chromosomes cross over.

Detailed explanation-4: -Mendel’s law of independent assortment does not apply to linkage. Inherited genes are said to be independent of one another under the law. Since two genes are located on the same chromosome, the linkage is an exception to this rule.

Detailed explanation-5: -Independent assortment of genes and their corresponding traits was first observed by Gregor Mendel in 1865 during his studies of genetics in pea plants.

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