If progeny plants
inherited a single whole gene set from each parent, then the experiment
in Fig. 9.5 cannot work. This is because the two characteristics ‘R’ and
‘y’ would then be linked to each other and cannot be independently
inherited....
These are the lines on Pg 145 ncert heredity and evolution
and fig 9.5 is the experiment related to independent inheritance of two seperate traits.
Please explain the above passage
Dear student,
According to Mendel's law of Independent Assortment, when two pairs of a trait are combined in a hybrid then one pair of character segregates independent of other pair of character, i.e., the alleles of one gene sort into the gametes independently of the alleles of another gene.Thus, the traits are inherited independently.
This could be further explained as follows :
A gene have two alternate forms , which are known as alleles, out of which one is dominant and one is recessive, These two alleles of a same gene refers one set of genes.
Regards.
According to Mendel's law of Independent Assortment, when two pairs of a trait are combined in a hybrid then one pair of character segregates independent of other pair of character, i.e., the alleles of one gene sort into the gametes independently of the alleles of another gene.Thus, the traits are inherited independently.
This could be further explained as follows :
A gene have two alternate forms , which are known as alleles, out of which one is dominant and one is recessive, These two alleles of a same gene refers one set of genes.
- If the progeny inherits a single whole gene set from each parent , for example :YY (yellow) and yy (green) and then the experiment will fail,as the progeny will be YYyy ,which is not possible. Thus progeny receives only one allele either Y or y of a gene from each parent.
- Mendel gave law of independent assortment according to which traits (seed colour and seed shape in this case) separate independently. If a progeny inherits complete whole set of gene from parent that means trait of shape and colour will be inherited together and then these characters R (seed shape) and Y (seed colour) will be linked and Mendel's law will fail (Genetic linkage could be defined as the tendency of alleles that are located close together on a chromosome to be inherited together) . Now we know that progeny never receives whole gene set and thus traits are not linked.
Regards.