Question

define complete linkage and incomplete linkage

Answer 1

Complete Linkage:

If linkage is complete, there should be parental combinations only and no recombination. Morgan (1919) reported a complete linkage in Drosophila. When ordinary male wild fly with grey body and normal wings was crossed with female having black body and vestigial wings, in F1, hybrids were all grey bodied and normal winged (with dominant characters).
Incomplete linkage produces new combinations of the genes in the progeny due to the formation of chiasma or crossing over in between the linked genes present on homologous chromosomes. When in sweet peas a cross is made between blue flower and long pollen (BBLL) with red flower and round pollen (bbll) in F1 expected blue flower and long pollen (BbLl) heterozygous condition is got

Answer 2

Answer:

complete linkage is defined as the state in which two loci are so close together that alleles of these loci are virtually never separated by crossing over. The closer the physical location of two genes on the DNA, the less likely they are to be separated by a crossing-over event.

Incomplete linkage: Incomplete linkage produces new combinations of the genes in the progeny due to the formation of chiasma or crossing over in between the linked genes present on homologous chromosomes.

Explanation: