Define linkage.
Define linkage.
Linkage:
- Linkage is a physical association of two genes. It can also be defined as the process of association of genes close together on the same chromosome. Linked genes sit close together on a chromosome, making them likely to be inherited together.
- The two types of linkage are-
1. Complete linkage 2. Incomplete linkage
Complete linkage:
1. The genes located on the same chromosome do not separate and are inherited together over the generations due to the absence of crossing over.
2. Complete linkage allows the combination of parental traits to be inherited as such.
3. It is rare but has been reported in male Drosophila and some other heterogametic organisms.
Incomplete linkage:
1. Genes present in the same chromosome have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type.
2. The number of recombinant individuals is usually less than the number expected in the independent assortment.
Linkage:
- Linkage is a physical association of two genes. It can also be defined as the process of association of genes close together on the same chromosome. Linked genes sit close together on a chromosome, making them likely to be inherited together.
- The two types of linkage are-
1. Complete linkage 2. Incomplete linkage
Complete linkage:
1. The genes located on the same chromosome do not separate and are inherited together over the generations due to the absence of crossing over.
2. Complete linkage allows the combination of parental traits to be inherited as such.
3. It is rare but has been reported in male Drosophila and some other heterogametic organisms.
Incomplete linkage:
1. Genes present in the same chromosome have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type.
2. The number of recombinant individuals is usually less than the number expected in the independent assortment.
