A) linkage
B) mutations
C) dominant characters
D) independent assortment
Correct Answer: D
Solution :
Recombinations are type of genetic variation, which appear due to reshuffling of genes in linkage group resulting in changes of genotype. It results due to independent assortment of chromosomes, which occurs at the time of meiosis/gametogenesis. According to this law, two factors of each trait assort at random and independent of the factors of other trait at the time of meiosis and get randomly as well as independently rearranged in offspring. Linkage is defined as the tendency of two or more genes to remain together in the original combination in the same chromosomes during the process of inheritance for number of generations. Theory of linkage was propounded by T H Morgan, eg, in man the genes for haemophilia are linked with colour blindness. Mutation is defined as the sudden change of a gene or chromosome from one form to another. It produces an alteration in characters under its control. The term mutation was introduced by Hugo de Vries. Dominant trait is an allele or Mendelian factor, which expresses itself in the hybrid (heterozygote) as well as in homozygous state. It is denoted by capital letter.
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