The geometrical device that helps to find out all the possible combinations of male and female gametes is called?a)Bateson squareb)Mendel squarec)Morgan squared)Punnett squareCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Punnett square is used to find out all the possible combination of male and female gametes. In monohybrid cross, a square of four is used and in dihybrid square of 16 is used.

Answer

Male plant (TT) produces gamete T and T .
Female plant (tt) produces gamete t and t.
In punnete square male gamete (T and T) is taken on one side and female gamete (t and t ) is taken on another side. male and female gametes on either side produces f1 progeny of all possible combinations (here Tt )which is represented inside the punnett square .
so correct answer is option D.
[ please refer NCERT text book class 12 chapter no.5 to know more about punnett square ]

Answer

The Punnett Square

The Punnett square is a geometrical device used in genetics to determine the possible combinations of male and female gametes, and thus predict the outcomes of genetic crosses. It was developed by the British geneticist Reginald Punnett in the early 20th century and is widely used by geneticists and breeders to study inheritance patterns.

Understanding the Punnett Square

The Punnett square is a grid-like structure that helps visualize the possible combinations of alleles from the male and female parents. It is divided into four quadrants, with each quadrant representing the possible gametes from each parent. The alleles from the male parent are written along the top of the square, and the alleles from the female parent are written along the left side.

Using the Punnett Square

To use the Punnett square, you simply need to fill in the grid with the respective alleles from each parent. Each cell within the grid represents a potential combination of alleles that could occur in the offspring. By analyzing the grid, you can determine the expected ratios of different genotypes and phenotypes in the offspring.

For example, let's consider a cross between two pea plants, one with yellow seeds (YY) and another with green seeds (yy). In this case, the Punnett square would have two rows and two columns. The top row would be filled with the alleles Y, representing the male parent's gametes, and the left column would be filled with the alleles y, representing the female parent's gametes.

Interpreting the Results

The Punnett square allows us to easily determine the different possible genotypes and phenotypes that can result from a genetic cross. In the example above, the Punnett square reveals that all the offspring will have a genotype of Yy, meaning they will have yellow seeds. This is because the dominant allele Y masks the expression of the recessive allele y.

By analyzing the Punnett square, we can also determine the expected ratios of different genotypes and phenotypes. In this example, all the offspring will have a genotype of Yy, resulting in a phenotypic ratio of 1:0 for yellow seeds to green seeds.

Conclusion

The Punnett square is a powerful tool that helps geneticists and breeders predict the outcomes of genetic crosses. By visually representing the possible combinations of male and female gametes, it allows us to determine the expected genotypes and phenotypes of offspring. It is an essential tool in the field of genetics and has greatly contributed to our understanding of inheritance patterns.

Answer

Two heterozygous white (brown fur is recessive) rabbits are crossed. What is the phenotype of the offspring?

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