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प्रश्न
A child has blood group O. If the father has blood group A and the mother has blood group B, work out the genotypes of the parents and the possible genotypes of the other offspring.
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उत्तर
If the father has blood group A, i.e., IAIA (homozygous), and the mother has blood group B, i.e., IBIB (homozygous), all offspring will have blood group AB (IAlB) rather than blood group O.
A child has blood group O only if both parents are heterozygous, i.e., father IAIi and mother IBIi.
Therefore, the parents of a child with blood group O will have genotypes IAi and IBi. A side from O blood group offspring, the child could have one of three other blood groups. They are IAi (blood group A), IBi (blood group B), and IAIB (blood group AB).
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संबंधित प्रश्न
Differentiate between the following:
Homozygous and Heterozygous
Differentiate between the following:
Monohybrid and Dihybrid
How would you find out whether a given tall garden pea plant is homozygous or heterzygous? Substantiate your answer with the help fo Punnett squares.
Explain Mendel’s monohybrid progeny with the help of any one cross.
Answer the following question.
Write the basis on which Alfred Sturtevant explained gene mapping.
Name the conditions when both the alleles are identical?
A garden pea plant produces axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant trait?
What do you understand by the terms phenotype and genotype?
A pure tall plant (TT) is crossed with the pure dwarf plant (tt), what would be the F1 and F2 generations? Explain.
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
What is the ratio of tall plants to dwarf plants in the F2 generation?
Differentiate between inherited and acquired characters. Give one example for each type.
Genotypic ratio of a monohybrid cross is ______.
A Monohybrid cross is ______
Punnett square is used to know
In a monohybrid cross of plants with red and white flowered plants, Mendel got only red-flowered plants. On self-pollinating these F1 plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.
Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes.
a. On the basis of the above given information, is the green eye colour a dominant or recessive trait? Justify your answer
b. What is the possible genetic makeup of Pooja’s brother’s eye colour?
c. What is the probability that the offspring of Pooja and Ravi will have green eyes? Also, show the inheritance of eye colour in the offspring with the help of a suitable cross.
OR
c. 50% of the offspring of Pooja’s brother are green eyed. With help of cross show how this is possible.
In a cross between red coloured and white coloured flowers, when plants with red coloured flowers of F1 generation were self pollinated, plants of F2 generation were obtained in which 75% of plants were with red flowers and 2.5% plants were with white flowers.
Explain the inheritance of traits in the above cross with the help of a flow chart only along with the ratio of plants obtained.
Given below is a schematic representation of the inheritance of the shape of the seeds of garden peas. Answer the questions that follow:
- Which is the dominant and recessive allele of the trait?
- What does the ratio 3 : 1 in the F2 generation represent?
- State Mendel's Law of Dominance.
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
A monohybrid cross is a genetic cross in which how many pair(s) of contrasting characters is/are studied?
Mendel used a monohybrid cross to understand how which feature passes from parents to offspring?
In the first filial generation, what is the observation for the cross \[TT \times tt\]?
What are the four genotypic outcomes of the cross \[Tt \times Tt\]?
What is the phenotypic ratio in F2?
What is the genotypic ratio in F2?
