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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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12th Standard English Medium Biology (Botany) Subject Classical Genetics Creative 3 Mark Questions with Solution Part - II

Published on: 21/06/2021

QB365 provides detailed and simple solution for every Creative Questions in class 12 Biology Subject. It will helps to get more idea about question pattern in every Creative questions with solution.

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Name the respective pattern of inheritance where F ₁ phenotype
a) resembles anyone of the two parents
b) is an intermediate between two parental traits.

In the chart given below, 'AA' are the genes located in a chromosome of Pisum sativum.
Observe the chart and mention the genetic phenomenon does it indicates.

Give an account on cytoplasmic male sterility.

Define trihybrid cross. Mention its F₂ phenotypic ratio.

State the law of segregation.

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Answers Key:

Generic 3

5 x 3 = 15

a) Dominance
b) Incomplete dominance

Pleiotropy - A single gene affecting many traits. Here the single gene AA controls the traits for flower colour, seed colour and leaf axil spot.

Male sterility found in pearl maize (Sorgum vulgare) is the best example for mitochondrial cytoplasmic inheritance. So it is called cytoplasmic male sterility. In this, male sterility is inherited maternally. The gene for cytoplasmic male sterility is found in the mitochondrial DNA.

A cross between homozygous parents that differ in three gene pairs (i.e. producing trihybrids) is called trihybrid cross.
F₂ Phenotypic ratio - 27: 9 : 9 : 9 : 3 : 3 : 3 : 1

The Law of Segregation (Law of Purity of gametes): Alleles do not show any blending. During the formation of gametes, the factors or alleles of a pair separate and segregate from each other such that each gamete receives only one of the two factors. A homozygous parent produces similar gametes and a heterozygous parent produces two kinds of gametes each having one allele with equal proportion. Gametes are never hybrid.