Question:

The Ti plasmid used in genetic engineering is obtained from

Updated On: Aug 1, 2022
  • Bacillus thuringensis
  • Agrobacterium rhizogenes
  • Agrobacterium lumifaciens
  • Escherichia coli
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The Correct Option is C

Solution and Explanation

Agrobacterium tumefaciens, bacterial genus is noted for crown gall tumor inducing ability. Oncogenic strains are host to a tumor inducing (Ti) plasmid which can be transmitted between species. A segment (T-DNA) of Ti plasmid is transmitted to plant host cell and is the immediate agent of tumour induction.
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Concepts Used:

Non-Mendelian Genetics

The term - non-mendelian inheritance refers to any pattern of heredity in which features do not separate according to Mendel's laws. These principles describe how features linked with single genes on chromosomes in the nucleus are passed down through generations.

Types of Non-Mendelian Inheritance

Codominance Inheritance

It is a form of incomplete dominance in which both alleles for the same feature are expressed in the heterozygote at the same time. For example, the MN blood types of humans.

Incomplete Dominance

In a heterozygote, the dominant allele does not always completely cover the phenotypic expression of the recessive gene, resulting in an intermediate phenotype which is referred to as "incomplete dominance”.