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Question : What is Neo- Mendelian genetics ? Describethe quantitativeinheritance controlled by two pairsof genes.

Answer»

Solution :1. NEO- Mendelian genetics :
The modification of Mendel's laws whichledtot eh discovery of different patterens of INHERITANCE or gene interations is called Neo- Mendeliangenetics.
2.Quantitativeinheritance controlled by two pairs of genes :
(1) The inheritanceof charactersthat aredetermined by two or moregene paireesare called quantitative inheritance.
(2) The inheritanceof kernel colour in wheat is a GOODEXAMPLE of quantitative inheritancecontrolledby two pairsof genes.
(3) Whena redkerneledvariety of wheatcrossed witha white kerneled variety, in `F_(1)`generation allwheatplantshadgrainswith intermediatecolourbetweenred and white.
(4) The `F_(2)`generation gave a ratio of 1 : 4 : 6: 4 : 1 .
(5)The continuousvariationsin the expression were as follows :
(i) Dark red (like the originalparent ) -1/16
(ii) Medium red (less thanparentplant but morethan ` F_(1)`hybrid )-4/16
(iii) INTERMEDIATE red (like ` F_(1)`hybrids )-6/16
(IV) Light red (less than ` F_(1)`hybrids)- 4/16
(v) white(likethe originalparent )-1/16


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