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A cross between two plants of Pisum sativum having violet coloured flowers, resulted in production of few plants producing white flowers. What would be the genotype of the parent plants?
- a)V V and Vv
- b)Vv and Vv
- c)V V and vv
- d)V V and VV
Correct answer is option 'B'. Can you explain this answer?
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A cross between two plants of Pisum sativum having violet coloured fl...
1. Violet flower is dominant trait and white flower is recessive trait. If violet flowered parents produce offspring which are white flowered then both parents are heterozygous.
2. So their genotypes will be Vv and Vv.
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A cross between two plants of Pisum sativum having violet coloured fl...
Genotype of the parent plants:
The cross between two plants of Pisum sativum with violet-colored flowers resulted in the production of some plants with white flowers. To determine the genotype of the parent plants, we need to analyze the phenotypic ratios observed in the offspring.
Phenotypic ratio:
The phenotypic ratio observed in the offspring is violet:white = 3:1. This ratio suggests that the trait for white flowers is recessive, as it only appears in the homozygous recessive form.
Deducing the genotype:
To deduce the genotype of the parent plants, let's assign the following symbols:
- V: Violet flower color (dominant allele)
- v: White flower color (recessive allele)
Based on the phenotypic ratio of 3:1, we can conclude that the parent plants had the following genotypes:
- The violet-flowered parent plant must be heterozygous (Vv). This is because it can produce both violet (VV) and white (vv) offspring when crossed with another parent plant.
- The white-flowered parent plant must be homozygous recessive (vv). This is because it can only contribute the recessive allele for white flower color (v) to the offspring.
Genotypes of the parent plants:
Therefore, the genotype of the parent plants involved in this cross would be:
- Violet-flowered parent: Vv
- White-flowered parent: vv
Explanation:
When two plants with violet-colored flowers (Vv) are crossed, the Punnett square predicts a phenotypic ratio of 3 violet:1 white. This indicates that the white flower trait is recessive and requires two copies of the recessive allele (vv) to be expressed. The violet-flowered parent must be heterozygous (Vv) since it produces both violet and white offspring. The white-flowered parent must be homozygous recessive (vv) since it can only contribute the recessive allele for white flowers to the offspring.
The cross between two plants of Pisum sativum with violet-colored flowers resulted in the production of some plants with white flowers. To determine the genotype of the parent plants, we need to analyze the phenotypic ratios observed in the offspring.
Phenotypic ratio:
The phenotypic ratio observed in the offspring is violet:white = 3:1. This ratio suggests that the trait for white flowers is recessive, as it only appears in the homozygous recessive form.
Deducing the genotype:
To deduce the genotype of the parent plants, let's assign the following symbols:
- V: Violet flower color (dominant allele)
- v: White flower color (recessive allele)
Based on the phenotypic ratio of 3:1, we can conclude that the parent plants had the following genotypes:
- The violet-flowered parent plant must be heterozygous (Vv). This is because it can produce both violet (VV) and white (vv) offspring when crossed with another parent plant.
- The white-flowered parent plant must be homozygous recessive (vv). This is because it can only contribute the recessive allele for white flower color (v) to the offspring.
Genotypes of the parent plants:
Therefore, the genotype of the parent plants involved in this cross would be:
- Violet-flowered parent: Vv
- White-flowered parent: vv
Explanation:
When two plants with violet-colored flowers (Vv) are crossed, the Punnett square predicts a phenotypic ratio of 3 violet:1 white. This indicates that the white flower trait is recessive and requires two copies of the recessive allele (vv) to be expressed. The violet-flowered parent must be heterozygous (Vv) since it produces both violet and white offspring. The white-flowered parent must be homozygous recessive (vv) since it can only contribute the recessive allele for white flowers to the offspring.
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A cross between two plants of Pisum sativum having violet coloured flowers, resulted in production of few plants producing white flowers. What would be the genotype of the parent plants?a)V V and Vvb)Vv and Vvc)V V and vvd)V V and VVCorrect answer is option 'B'. Can you explain this answer?
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