How do these traits get expressed??
Answers
Expression by Dominant and Recessive factors:
Factors or alleles are actually genes orsegments of DNA that control the expression of traits. They operate through controlling the synthesis of proteins or enzymes formed from them. A dominant factor takes part in the synthesis of a fully functional protein or enzyme so that it produces its morphological or physiological effect. A recessive factor is unable to produce the fully effective protein or enzyme. Thelatter is incomplete, defective or little efficient. As a result, it is unable to express its effect in the presence of dominant factor. Its effect becomes apparent only when the recessive allele occurs in a pair.Plant height is controlled by hormones. Tallness or dwarfnesswould depend upon the amount of growth promoting hormone. The latter would be influenced by the efficiency of the process for making it. A protein that is important for this process is synthesized by the factor for tallness more efficiently than the factor for dwarfness. As a result plants having the T factor grow taller while the ones having tt remain dwarf.
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❥Presence of genes on chromosomes in male and female gametes, together decide which trait will be expressed in the progeny. In all organisms genes areresponsible for transfer of traits from parents to progeny. Every characteristic is linked with two type of genes.
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