Coupling and repulsion are the two faces of
Crossing over
Linkage
Chiasmata
Mutation
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
After crossing two plants, the progenies are found to be male sterile. The phenomenon is found to be maternally inherited and is due to some genes which reside in
Fraternal twins are produced when
Mongoloid condition is related to or In mongolism a patient shows
In $F_{2}$-generation, quantitative inheritance $1: 4: 6: 4: 1$ is obtained instead of