Mendel formulated the law of purity of gametes on the basis of :-a)test crossb)dihybrid corssc)back crossd)monohybrid crossCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Through this cross he found about the two major types of traits that are Dominant traits(traits that can be seen in an organism) and reccessive traits(traits that cannot be seen under the dominance of dominant traits but are present in organisms). The result he got by this cross shows the purity of the gametes.

Answer

D

Answer

In case of pea plant, two types of tall plants are possible- one homozygous and other heterozygous. In case a homozygous, tall pea plant is crossed with a homozygous dwarf pea plant, then all the off springs are tall, i.e., dwarf character masked and is not shown by any of the offspring but next when two of the progeny heterozygous tall pea plants are crossed the dwarf character reappears, even when this time none of the parent was dwarf. The characters are passed on from one generation to the other by gametes. Hence, it is clear that gametes remain pure between generation the gamete with alleles for dwarfness is not disturbed or polluted or altered between generations and even when the F1​ plants were phenotypically tall the allele for dwarfness remained pure and were passed on to F2​ plants.

Answer

The reason is simple, it was due to the Monohybrid cross that Mendel could find that characters that we are not expressed in the To generation where expressed in F2 generation. This could mean gametes independently contains alleles.

Answer

Your ans. will be option (D) coz a gamete carries only a recessice or a dominant allel but not both the alleles.

Answer

Introduction to Mendel's Law of Purity of Gametes
Mendel's law of purity of gametes is a fundamental concept in genetics that stems from his experiments with pea plants. This law states that during the formation of gametes, the alleles for a trait separate so that each gamete carries only one allele for each gene.

Basis of the Law: Monohybrid Cross
The correct answer to the question is option 'D' - monohybrid cross. Here’s how Mendel formulated this law:

Monohybrid Cross Definition: A monohybrid cross involves tracking the inheritance of a single trait, such as flower color, by crossing two purebred organisms (homozygous) that differ in that trait.
Experimental Setup: Mendel began with purebred plants, one with dominant traits (e.g., purple flowers) and another with recessive traits (e.g., white flowers).
F1 Generation: The first generation (F1) from this cross exhibited only the dominant trait, indicating that the dominant allele masked the recessive one.
F2 Generation: When the F1 plants were interbred, Mendel observed a 3:1 ratio of dominant to recessive traits in the F2 generation, indicating the reappearance of the recessive trait.
Conclusion: This led Mendel to conclude that each organism carries two alleles for each trait, but only one allele is passed on to the gametes, demonstrating the law of purity of gametes.

Significance of the Law
Understanding the purity of gametes is crucial for predicting inheritance patterns and for the foundational concepts of genetics that are used in various biological fields today. Mendel's work laid the groundwork for modern genetics, influencing how we study heredity and variation in organisms.

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