Mandel crossed a homozygus pea plant having yellow round seed with another pea plant bearing green wrinkled seed. He found that in some of the f2 population new combination of parental charecters were observed.How wiill you explain the appearence of new combination of parental chreexctaristics in f2 offspring ? Support your answer with ounnet square.
Question
Mandel crossed a homozygus pea plant having yellow round seed with another pea plant bearing green wrinkled seed. He found that in some of the f2 population new combination of parental charecters were observed.How wiill you explain the appearence of new combination of parental chreexctaristics in f2 offspring ? Support your answer with ounnet square.
Solution
The appearance of new combinations of parental characteristics in the F2 offspring can be explained by the principle of independent assortment, which is one of the laws of inheritance proposed by Gregor Mendel.
The principle of independent assortment states that the alleles for separate traits are passed independently of one another from parents to offspring. This means that the inheritance of an allele for yellow or green seed color does not affect the inheritance of an allele for round or wrinkled seed shape.
Here's how you can illustrate this with a Punnett square:
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Let's denote the allele for yellow as "Y", green as "y", round as "R", and wrinkled as "r". The homozygous yellow round seed parent would have the genotype "YYRR", and the green wrinkled seed parent would have the genotype "yyrr".
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In the F1 generation, all offspring would have the genotype "YyRr", resulting from the cross between "YYRR" and "yyrr". This means all F1 offspring would have yellow round seeds, as "Y" and "R" are dominant.
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In the F2 generation, "YyRr" would self-fertilize. The possible combinations of alleles in the gametes would be "YR", "Yr", "yR", "yr".
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Draw a 4x4 Punnett square, with the four possible combinations of alleles from one parent on one axis, and the four possible combinations from the other parent on the other axis.
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Fill in the Punnett square by combining the alleles from each parent.
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The Punnett square will show that there are 9 combinations that result in yellow round seeds, 3 combinations that result in yellow wrinkled seeds, 3 combinations that result in green round seeds, and 1 combination that results in green wrinkled seeds.
This shows that the traits for seed color and seed shape assort independently, resulting in new combinations of traits in the F2 generation.
Similar Questions
Mandel crossed a homozygus pea plant having yellow round seed with another pea plant bearing green wrinkled seed. He found that in some of the f2 population new combination of parental charecters were observed.
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