How do traits get expressed? Explain using plant height as a characteristic.
Answers
Answer:
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.
F
1
Generation: All plants obtained were heterozygous tall (Tt). Plants from F
1
generation were self-pollinated to obtain F
2
generation.
F
2
Generation: One homozygous tall plant (TT), two heterozygous tall plants (Tt) and one homozygous dwarf plant (tt) were obtained.
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.
F
1
Generation: All plants obtained were heterozygous tall (Tt). Plants from F obobtain 1
generation were self-pollinated to obtain F
2
generation.
F
2
Generation: One homozygous tall plant (TT), two heterozygous tall plants (Tt) and one homozygous dwarf plant (tt) were obobtained
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