Extra chromosomal inheritance
Free online life science study material. This is the inheritance in which the genes involved are present outside the nucleus.
There is unequal distribution by both the parents.
The result of reciprocal cross is different.
There is no segregation as unequal contribution by parents. Also called irregular segregation.
Free online life science study material. This is the inheritance in which the genes involved are present outside the nucleus.
There is unequal distribution by both the parents.
The result of reciprocal cross is different.
There is no segregation as unequal contribution by parents. Also called irregular segregation.
Extra-chromosomal inheritance can be due to
1. Cytoplasmic inheritance as in most cases female contribute more cytoplasm.
2. Symbionts like mitochondria and chloroplast.
Classical ex.
Mirabilis Jalapa
It has three kinds of branches Green leaves, white leaves and variegated leaves.
The color of leaves is contributed by cytoplasm or we can say chloroplast.
When we take female of green color and male of white, the progeny will be green and the result of reciprocal cross is different.
1. Cytoplasmic inheritance as in most cases female contribute more cytoplasm.
2. Symbionts like mitochondria and chloroplast.
Classical ex.
Mirabilis Jalapa
It has three kinds of branches Green leaves, white leaves and variegated leaves.
The color of leaves is contributed by cytoplasm or we can say chloroplast.
When we take female of green color and male of white, the progeny will be green and the result of reciprocal cross is different.
another ex. Chlamydomonas
It has a gene in plastid called streptomycin resistance gene.
When female is resistant and male is sensitive then the progeny is all resistant.
It has a gene in plastid called streptomycin resistance gene.
When female is resistant and male is sensitive then the progeny is all resistant.
