Genetics: Fundamentals and Applications by SRIVASTAVA H C ET.AL

By SRIVASTAVA H C ET.AL

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Incomplete dominance: For testing the law of dominance several scientists have done many experiments on several plants and animals. They observed that law of dominance is not always true. In some case dominance is incomplete. The result is that characters of F1 generation do not match with any parent (Fig-8). Examples of such phenomenon are found in 4 o'clock (Mirabilis jaZapa), snap dragon and australian fawl. In case of 4 O'clock plant (MirabiZis jaZapa) when red flower type was crossed with white flower type then in the F1 hybrids neither red nor white flowers were present.

After selfing the F1 generation the F2 generation was produced. F2 revealed 13 white feathered poultry and 3 coloured feather poultry. So the ratio was 13: 3 . This ratio was the result of inhibitory factor (gene). 47 Genetics: Fundamentals and Applications Inhibitory factor ( gene) is that gene which does not express its effects but inhibits the affect of other gene. This phenomenon has been expressed by following experiment White feathered fowl x coloured feather fowl. wwCC WWcc WwCc White feathered fowls Selfed 9WC 3Wc white feather 3wC lwc white feathers coloured feathers white fethers It can be also written as: white feathers: 9+3+1=13 coloured feathers: 3 Hence, phenotypic ratio=13:3 Genotypic ratio=9:3:3:1 In white feathered fowls there is W gene but this gene independently does not produce any white colour in feathers.

Test Cross: It is the hybridization of Fl with recessive parent. Tetraploid: A cell or organism with four sets of basic chromosomes is called tetraploid. Top Cross: Top cross is crossing of a selection or clone with inbred line/variety/single cross. It is also known as inbred variety cross. Transgressive segregation: Segregation of such offsprings which are better or inferior than their perents is transgressive segregation. Translocation: Transfer of segment of a chromosome on the same 21 Genetics: Fundamentals and Applications chromosome or other chromosome is known as translocation.

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