Sometimes, when Mendel crossed two pea plants with each other, he obtained a phenotypic ratio of 3:1 purple-flowered pea plants to white-flowered pea plants. These results are consistent with which set of parents?Multiple ChoiceHomozygous purple pea plant and homozygous white pea plantHeterozygous purple pea plant and homozygous purple pea plantHeterozygous purple pea plant and homozygous white pea plantHeterozygous purple pea plant and heterozygous purple pea plant
Question
Sometimes, when Mendel crossed two pea plants with each other, he obtained a phenotypic ratio of 3:1 purple-flowered pea plants to white-flowered pea plants. These results are consistent with which set of parents?Multiple ChoiceHomozygous purple pea plant and homozygous white pea plantHeterozygous purple pea plant and homozygous purple pea plantHeterozygous purple pea plant and homozygous white pea plantHeterozygous purple pea plant and heterozygous purple pea plant
Solution
The correct answer is "Heterozygous purple pea plant and heterozygous purple pea plant".
Here's why:
Mendel's law of segregation states that during the formation of gametes, the two alleles responsible for a trait separate from each other. Alleles for a particular trait are then "recombined" during fertilization, producing the genotype for the traits of the offspring.
In this case, the purple flower color is dominant over white. If we denote the purple allele as "P" and the white allele as "p", a heterozygous purple pea plant would have a "Pp" genotype.
If two heterozygous purple pea plants (Pp) are crossed:
- 25% of the offspring will inherit two "P" alleles (PP), resulting in purple flowers.
- 50% of the offspring will inherit one "P" and one "p" allele (Pp), also resulting in purple flowers because the purple allele is dominant.
- 25% of the offspring will inherit two "p" alleles (pp), resulting in white flowers.
This gives a phenotypic ratio of 3:1 purple-flowered pea plants to white-flowered pea plants, which is consistent with the results Mendel obtained.
Similar Questions
Mendel bred a purple-flowered pea plant with a white-flowered pea plant and found that all the offspring had purple flowers. But then when he bred together two of the purple-flowered offspring, some of their offspring had white flowers.Using the concepts of dominant and recessive alleles, explain how the trait of white flowers skipped a generation.
Mendel described the parents he crossed to make his first generation of pea plants as being pure for each trait. Today we use the term homozygous instead of pure.Mendel’s first-generation pea plants with purple flowers had which set of alleles?A.Two alleles for purple flowersB.Two alleles for white flowersC.One allele for purple flowers and one allele for white flowersD.The alleles for flowers and the alleles for color
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.
A scientist was carrying out some of Mendel's experiments and wanted to understand how seed colour in peas was inherited. The scientist crossed a yellow heterozygous plant with a green homozygous plant.Determine the genotypes of the parent plants.
Which one of the following traits of garden pea studied by Mendel was a recessive feature?Green seed colourGreen pod colourRound seed shapeAxial flower position
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