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प्रश्न
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.
उत्तर
(a) Yes, green eye colour is recessive as it will express only in homozygous condition.
(b) BB, Bb
(c) bb*Bb
| B | b | |
| b | Bb | bb |
| b | Bb | bb |
Genetic cross - 50% of the offsprings can have green eye colour.
OR
(c) Brother is heterozygous (Bb) and wife is green (bb)
Wife bb*Bb brother
| B | b | |
| b | Bb | bb |
| b | Bb | bb |
50% of the offsprings can have green eye colour as per the cross shown.
APPEARS IN
संबंधित प्रश्न
Differentiate between the following -
Monohybrid and Dihybrid.
When a cross in made between tall plant with yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be
- Tall and green.
- Dwarf and green.
Explain Mendel’s monohybrid progeny with the help of any one cross.
Name the conditions when both the alleles are identical?
What do you understand by the terms phenotype and genotype?
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 do the plants of the F1 generation look like?
Genotypic ratio of a monohybrid cross is ______.
Punnett square is used to know
Cross between hybrid and recessive parent:
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.
