In which one of following combinations (a-d) of number of chromosomes is present day hexaploid wheat

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4.Principles of Inheritance and Variation

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In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?

Combination Monosomic Haploid Nullisomic TrisomicZ

$27-28-42-43$

$7-82-40-42$

$21-7-42-43$

$41-21-40-43$

Solution

The basic chromosome number of wheat is $7(x=7)$ and its hexaploid species contain $42(6 \times 7 i$ chromosomes. Thus, it's monosomic (one chromosomes missing) contains $41(42-1)$ chromosomes. Haploid contains $21$ (half to the $42$ ) chromosomes. Nullisomic (one chromosome pair missing) contains $40(42-2)$ chromosomes and trisomic contain (one chromosome extra) $43(42+1)$ chromosomes.

Standard 12

Biology

$A$ : Myotonic dystrophy is caused by recessive mutant pleiotropic gene.
$R$ : Gene mutation leads to more synthesis of fibrillin proteins.

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Drosophila flies with one half of the body male and other half female is referred to as

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(AIPMT-1994)

The first definite proof of mutagenic action of $X$-rays was given by

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Improvement of genetic characters and present day generation on the basis of best nutrition and training is called

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Which phenomena leads to the variation in $DNA$

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In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented? Combination Monosomic Haploid Nullisomic TrisomicZ

Solution

Similar Questions

$A$ : Myotonic dystrophy is caused by recessive mutant pleiotropic gene. $R$ : Gene mutation leads to more synthesis of fibrillin proteins.

Drosophila flies with one half of the body male and other half female is referred to as

The first definite proof of mutagenic action of $X$-rays was given by

Improvement of genetic characters and present day generation on the basis of best nutrition and training is called

Which phenomena leads to the variation in $DNA$

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In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?

Combination Monosomic Haploid Nullisomic TrisomicZ

$A$ : Myotonic dystrophy is caused by recessive mutant pleiotropic gene.
$R$ : Gene mutation leads to more synthesis of fibrillin proteins.