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TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set D

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TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set D

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TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set C

12th Standard English Medium Biology (Botany) Subject Chromosomal Basis of Inheritance Creative 2 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Questions:

Generic 2

5 x 2 = 10

Comment on the chromosomal condition; 2n - 2.

What is ploidy?

What are bivalents? When does this condition is noticed in a cell?

What are linked genes?

Define linkage. Mention its types.

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Answers Key:

Generic 2

5 x 2 = 10

Loss of pair of homologous chromosome from the diploid set is called Nullisomy. Selfing of monosomic plants produces Nullisomics. They are generally lethal.

Sometimes, the chromosome number of somatic cells changed due to addition or elimination of individual chromosome or basic set of chromosomes. This condition in known as ploidy.

During zygotene stage of prophase I of meiosis I, homologous chromosomes are aligned side by side resulting in a pair of homologous chromosomes called bivalents.

Genes located close together on the same chromosome and inherited together are called linked genes.

Tendency of genes to remain together during separation of chromosomes is called linkage. Linkage are of 2 types - complete linkage and incomplete linkage.