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Chromosomal Theory Of Inheritance Linkage And Recombination Sex Determination Free Doubts and Solutions

CBSE - XII Science - Biology - Principles of Inheritance and Variation

the presence of continuous phenotypic variation in an F2 generatin suggest that a character is inherited by

Asked by rohitraman1115 30th June 2018, 4:59 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

multiple answers correct question

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Asked by minipkda 1st June 2018, 5:45 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

linkage occurs on which chromosome usually and why?

Asked by imtiyazmulla68 30th March 2018, 9:55 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

what is the actaual experiment or conclusion made by t.h mporgan on experimenting fruit fly  

Asked by khanklashan319 9th March 2018, 4:28 AM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

A bald man whose father was normal is getting married to a female whose both parants are normal comment on their progeny? In this question why female cant be Bb

Asked by ashutosh25807 22nd February 2018, 9:32 AM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Please give me the format of Biology Practical Exam. Please explain how to write the perfect answers to the following questions: 1. Identify the Pedigree chart. 2. Determine the pH of given soil samples. 3. Find out the Mendelian ratio. 

Asked by sunil2791 7th February 2018, 10:05 AM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

In Drosophila, 2n=8. How many linkage groups are present?

Asked by akshitaasia 11th December 2017, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Linkage and crossing over of genes are alternatives of each other. Justify with a suitable example.

Asked by pksunilnair 3rd October 2017, 3:48 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

linkage and crossing over are two alternative phenomena. Explain

Asked by Pragnya Kar 18th March 2016, 1:05 AM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

how many linkage groups are present in Drosophila?

Asked by haider.samina 16th March 2015, 4:11 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

WHAT ARE LINKAGE AND RECOMBINATION ? BRIEFLY DESCRIBE WITH DIAGRAM.

Asked by poojaparmar065 12th September 2014, 5:06 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

how it was concluded that genes are located on chromosomes ?

Asked by Snehil Shekhar 26th June 2014, 6:07 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Explain the chromosomal theory of inheritance.

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

(i)  Why are grasshopper and Drosophila said to show male heterogamety? Explain. (ii) Explain female heterogamety with the help of an example.

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Explain the sex determination mechanism in humans. How is it different in birds?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Mention the phenomenon of sex determination in the following cases: (a)  Male Drosophila - XY (b)  Female fowl - ZW (c) Male grasshopper - XO

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

During his studies on genes in Drosophila which were sex-linked, T. H. Morgan found that the population phenotypic ratios deviated from  the expected 9:3:3:1 ratio. Explain the conclusion he arrived at.

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

The map distance in certain organisms between gene A and B is 4 units, B and C is 2 units and gene C and D is 8 units. Which one of these gene pairs will show more recombination frequency? Give reasons in support of your answer.  

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

The male fruit fly and female fowl are heterogametic, while the female fruit fly and the male fowl are homogametic. Why are they called so?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Who proposed the chromosomal theory of inheritance? Point out any two similarities in the behaviour of chromosomes and genes.

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

What are linked genes? How can a pair of linked genes be identified?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

What is gene locus?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

What is non-disjunction?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

What is crossing over?

Asked by Topperlearning User 16th June 2014, 3:46 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

A haemophilic son was born to normal parents. Give the genotypes of the parents.

Asked by Topperlearning User 16th June 2014, 3:46 PM
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