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An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the five genes assort independently, determine the following proportions:
Progeny that are expected to have the genotype AabbCcDdE–
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3. Extensions to Mendelian Inheritance
Understanding Independent Assortment
Scelta multipla
Why don't some traits segregate independently during meiosis?
A
Because meiosis does not involve the separation of homologous chromosomes
B
Because all traits are always inherited together regardless of chromosome location
C
Because independent assortment only occurs in prokaryotes
D
Because the genes controlling these traits are located close together on the same chromosome (linked genes)
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Understand the principle of independent assortment, which states that genes located on different chromosomes are inherited independently during meiosis due to the random orientation of homologous chromosome pairs.
Recognize that genes located close together on the same chromosome tend to be inherited together because they are physically linked; this phenomenon is called genetic linkage.
Recall that during meiosis, crossing over (recombination) can occur between homologous chromosomes, which may separate linked genes if they are far enough apart, but closely linked genes have a lower chance of being separated.
Conclude that traits controlled by genes that are close together on the same chromosome do not segregate independently because they tend to be inherited as a group, violating Mendel's law of independent assortment.
Therefore, the reason some traits do not segregate independently during meiosis is due to the physical proximity of their controlling genes on the same chromosome, leading to genetic linkage.
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