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When a cross is made between offsprings and one of its parents, it is known as :
- a)back cross
- b)reciprocal cross
- c)dihybrid cross
- d)monohybrid cross
Correct answer is option 'A'. Can you explain this answer?
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When a cross is made between offsprings and one of its parents, it is ...
1.Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent. This method has long been used in horticulture, e.g. to incorporate desirable traits to the elite line of crops.
2.Reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern. All parent organisms must be true breeding to properly carry out such an experiment.
3.Dihybrid cross is a cross between two different lines/genes that differ in two observed traits.
4.A monohybrid cross is a cross between two organisms with different variations at one genetic chromosome of interest.
Hence the correct answer is option A.
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When a cross is made between offsprings and one of its parents, it is ...
Understanding Back Cross
A back cross is an important concept in genetics, especially in breeding practices. Below is a detailed explanation of what a back cross is and its significance.
Definition of Back Cross
- A back cross, also known as test cross, occurs when the offspring (F1 generation) are crossed with one of their parents (P generation).
- This method is primarily used to determine the genotype of the offspring, especially when the dominant phenotype is being analyzed.
Purpose of Back Cross
- Genotype Determination: It helps in identifying whether an organism exhibiting a dominant trait is homozygous or heterozygous.
- Breeding Improvement: Used in agriculture and horticulture to enhance desirable traits in plants and animals.
How Back Cross Works
- In a typical back cross scenario, let’s consider a scenario of flower color in pea plants (e.g., purple vs. white).
- If the F1 offspring (which are all purple) are crossed back with a homozygous white-flowered parent, the resulting offspring will exhibit a 1:1 ratio of purple to white flowers, allowing the determination of the F1 offspring's genotype.
Comparison with Other Crosses
- Reciprocal Cross: Involves switching the parents in a genetic cross to observe any differences in the offspring.
- Dihybrid and Monohybrid Crosses: Focus on two traits and one trait respectively, rather than returning to a parent as in back cross.
In summary, the back cross method is essential for genetic analysis and breeding programs, allowing for the evaluation and selection of desired traits in future generations.
A back cross is an important concept in genetics, especially in breeding practices. Below is a detailed explanation of what a back cross is and its significance.
Definition of Back Cross
- A back cross, also known as test cross, occurs when the offspring (F1 generation) are crossed with one of their parents (P generation).
- This method is primarily used to determine the genotype of the offspring, especially when the dominant phenotype is being analyzed.
Purpose of Back Cross
- Genotype Determination: It helps in identifying whether an organism exhibiting a dominant trait is homozygous or heterozygous.
- Breeding Improvement: Used in agriculture and horticulture to enhance desirable traits in plants and animals.
How Back Cross Works
- In a typical back cross scenario, let’s consider a scenario of flower color in pea plants (e.g., purple vs. white).
- If the F1 offspring (which are all purple) are crossed back with a homozygous white-flowered parent, the resulting offspring will exhibit a 1:1 ratio of purple to white flowers, allowing the determination of the F1 offspring's genotype.
Comparison with Other Crosses
- Reciprocal Cross: Involves switching the parents in a genetic cross to observe any differences in the offspring.
- Dihybrid and Monohybrid Crosses: Focus on two traits and one trait respectively, rather than returning to a parent as in back cross.
In summary, the back cross method is essential for genetic analysis and breeding programs, allowing for the evaluation and selection of desired traits in future generations.
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When a cross is made between offsprings and one of its parents, it is known as :a)back crossb)reciprocal crossc)dihybrid crossd)monohybrid crossCorrect answer is option 'A'. Can you explain this answer?
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