EASY
Earn 100

What are the different types of crossing over?

Important Questions on Principles of Inheritance and Variation

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
In a dihybrid cross between genes yellow, white and miniature characters, the parental % between yellow and white and recombination % is 92 and 8 respectively, and the cross between white and miniature characters, the recombination is 38% and parental is 62%. Identify the genetic map of these.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over

Give one significant difference between the following:

Linkage and crossing over

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance gene was explained by:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
A plant heterozygous for height and flower colour TtRr are selfed and 1600 of the resulting seeds are planted. If the distance between the loci controlling height and the flower colour is 1 centiMorgan (cM), then how many offsprings are expected to be short with white flower ttrr? 
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
What map unit (Centimorgan) is adopted in the construction of genetic maps?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
“When” two different genes came from the same parent they tend to remain together.
i) What is the name of this phenomenon?
ii) Draw the cross with a suitable example.
iii) Write the observed phenotypic ratio.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over

_______are located on non-homologous region of X and Y chromosomes.

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Explain the mechanism of crossing over.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Write the steps involved in molecular mechanism of DNA recombination with diagram.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Select the correct statement from the ones given below with respect to dihybrid cross.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
What is recombination? Discuss the applications of recombination from the point of view of genetic engineering.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
When there is absence of crossing over, the genes are
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Crossing over, due to which there is genetic recombination in higher organisms is found in between which of the following?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
How many map units separate two alleles A and B if the recombination frequency is 0.09?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
The number of linkage groups in a sperm and ovum of human is, respectively:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
The genes A and B are 10 cm apart on a chromosome. If an AB/ab heterozygote is test crossed to ab/ab, how many of each progeny class would you assume out of 100 total progeny?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Which of the following pairs is wrongly matched? 
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over

Which of the following sentences are correct?

1. The offspring exhibit only parental combinations due to incomplete linkage

2. The linked genes exhibit some crossing over in complete linkage

3. The separation of two linked genes are possible in incomplete linkage

4. Crossing over is absent in complete linkage

 

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Linkage and Crossing Over
Accurate mapping of genes can be done by three point test cross because increases