GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are linked together.
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They do not segregate independently.
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They travel together during gamete formation.
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They always segregate independently.
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Detailed explanation-1: -Which statement is not true of genes located close together on the same chromosome? They always segregate independently. Which statement pertains to Mendel’s law of segregation? Two alleles for each trait separate during meiosis.
Detailed explanation-2: -Genes that are sufficiently close together on a chromosome will tend to “stick together, ” and the versions (alleles) of those genes that are together on a chromosome will tend to be inherited as a pair more often than not. This phenomenon is called genetic linkage.
Detailed explanation-3: -Key Points. Alleles positioned on the same chromosome are not always inherited together because during meiosis linked genes can became unlinked. Frans Janssen suggested chromosomes become unlinked during homologous recombination, a process where homologous chromosomes exchange segments of DNA.
Detailed explanation-4: -Final answer: The genes are tightly linked is not true of two genes that show 50% recombination frequency.