$9 : 3 : 3 : 1$ ratio is modified to $9 : 7$ ratio due to
Complementry gene
Epistatic gene
Hypostatic gene
Supplementry gene
Colour of endosperm in maize is an example of
Linkage was first suggested by
Genes that are similar in phenotypic effect when present separately, but together interact to produce a different trait and ratio is $9 : 7$ in $F_2$ generation. What are such genes known as
Sex linked traits are the traits determined by
Experimental verification of the chromosomal theory of inheritance was given by