Two heterozygous parents are crossed. If | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

Welcome to the NCERT Solutions for Class 12 Biology - Chapter Principles of Inheritance and Variation. This page offers a step-by-step solution to the specific question from Exercise 1, Question 8: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 8: Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?

Answer:

Linkage is defined as the coexistence of two or more genes in the same chromosome. If the genes are situated on the same chromosome and lie close to each other, then they are inherited together and are said to be linked genes.

For example, a cross between yellow body and white eyes and wild type parent in a Drosophila will produce wild type and yellow white progenies. It is because yellow bodied and white eyed genes are linked. Therefore, they are inherited together in progenies.

distribution of phenotypic features in F1 generation

Other Questions of Chapter Principles of Inheritance and Variation

Q: Explain the Law of Dominance using a monohybrid cross.

Q: When a cross in made between tall plants with yellow seeds (Ttyy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be (a) Tall and green. (b) Dwarf and green.

Q: Mention any two autosomal genetic disorders with their symptoms.

Q: Who had proposed the chromosomal theory of inheritance?

Q: A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.

Q: What is pedigree analysis? Suggest how such an analysis, can be useful.

Q: A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?

Q: Briefly mention the contribution of T.H. Morgan in genetics.

Q: Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

Q: Define and design a test − cross?

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Study Tips for Answering NCERT Questions:

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Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Principles of Inheritance and Variation.
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Comments

Tanisha Meena
Sep 28, 2019

What is the meaning of "wild type" here?