Give differences : Crossing over and Linkage
Crossing over | Linkage |
$(1)$ It leads to separation of linked genes. | $(1)$ Keeps the genes together. |
$(2)$ It involves exchange of segments between non sister chromatids of homologous chromosomes. | $(2)$ It involves individual chromosomes. |
$(3)$ The frequency of crossing over can never exceed $50 \%$. | $(3)$ The number of linkage group can never be more than haploid chromosome number. |
$(4)$ It increases variability by forming new gene combinations. | $(4)$ It reduces variability. |
Frequency of crossing over in a chromosome is an index of
The distance between two genes in a chromosome is measured in cross-over units which represent
Definitions / Explanation : Linkage
Assertion : In case of incomplete linkage, linked gene show new combination along with parental combination.
Reason : In case of incomplete linkage, linked genes are separated by crossing over.