AP BIOLOGY

HEREDITY

LINKED GENES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Mendel did not observe linkage due to
A
There were many chromosomes to handle
B
chracters he studied were located on different chromosomes
C
he did not have powerful microscope
D
he studied pure plants
Explanation: 

Detailed explanation-1: -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-2: -Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.

Detailed explanation-3: -Mendel did not discover genetic linkage but at the end of his first paper reported experiments with beans that almost certainly show that he was aware of another phenomenon, later elaborated by Bateson as epistasis.

Detailed explanation-4: -Mendel failed to discover linkage because seven characters chosen by him were.

Detailed explanation-5: -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. Thus the independent assortment is violated by linkage.

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