HEREDITY
LINKED GENES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The theory that species evolved through natural selection
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The theory that traits could be dominant or recessive
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The theory that chromosomes did not carry genetic information
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The theory that flies prefer to have white eyes
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Detailed explanation-1: -Little did Morgan know that, with this white-eyed fly, he was about to confirm the chromosome theory. In doing so, Morgan would also be the first person to definitively link the inheritance of a specific trait with a particular chromosome.
Detailed explanation-2: -Morgan began breeding the white-eyed mutant fly and found that in one generation of flies, the trait was only present in males. Through more breeding analysis, Morgan found that the genetic factor controlling eye color in the flies was on the same chromosome that determined sex.
Detailed explanation-3: -In January 1910, a century ago, Thomas Hunt Morgan discovered his first Drosophila mutant, a white-eyed male (Morgan 1910). Morgan named the mutant gene white and soon demonstrated that it resided on the X chromosome.
Detailed explanation-4: -Morgan’s crucial, chromosome theory-verifying experiments began when he found a mutation in a gene affecting fly eye color. This mutation made a fly’s eyes white, rather than their normal red.