How Do Traits Get Expressed
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Answer:
Traits are coded in the form of genes, genes are sequences which would code for particular polypeptide which would eventually lead to the formation of particular proteins, proteins would then lead to the expression of particular trait. For example trait for skin colour is determined by genes which code for enzyme which make melanin (skin pigment)...
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The gene which decides the appearance of an organism even in the presence of an alternative gene is known as a dominant gene. The trait expressed is known as a dominant trait. The dominant gene is represented by a capital letter. The gene which decides the appearance of an organism only in the presence of another identical gene is called a recessive gene. The trait expressed is known as a recessive trait. The recessive gene is represented by a small letter. For example, Pure tall (TT) pea plant was crossed with dwarf (tt) plant. F¹ Generation: All plants obtained were heterozygous tall (Tt). Plants from F¹ generation were self-pollinated to obtain F² generation.F² Generation: One homozygous tall plant (TT), two heterozygous tall plants (Tt) and one homozygous dwarf plant (tt) were obtained.