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प्रश्न
Outline a project which aims to find the dominant coat colour in dogs.
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उत्तर
Dogs have a variety of genes that govern coat colour. There are at least eleven identified gene series (A, B, C, D, E, F, G, M, P, S, T) that influence coat colour in dog.
A dog inherits one gene from each of its parents. The dominant gene gets expressed in the phenotype. For example, in the B series, a dog can be genetically black or brown.
Let us assume that one parent is homozygous black (BB), while the other parent is homozygous brown (bb).
| bb | BB | ||
| B | B | ||
| b | Bb | Bb | |
| b | Bb | Bb | |
In this case, all the offspring will be heterozygous (Bb).
Since black (B) is dominant, all the offspring will be black. However, they will have both B and b alleles.
If such heterozygous pups are crossed, they will produce 25% homozygous black (BB), 50% heterozygous black (Bb), and 25% homozygous brown (bb) offspring.
| B | b | |
| B | BB | Bb |
| b | Bb | Bb |
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संबंधित प्रश्न
How do Mendel’s experiments show that the traits may be dominant or recessive?
"A trait may be inherited, but may not be expressed." Justify this statement with the help of a suitable example.
Define heredity.
Name the information source for making proteins in the cells.
List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants.
A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?
What constitutes the link between one generation and the next?
Name the scientist who gave the laws of inheritance.
What will you get in the F1 and F2 generations in the following cross?
Pure tall pea plant × Pure dwarf pea plant
In the F2 generation of a cross, progeny having different traits are produced in the ratio 3 : 1. State whether it is a monohybrid cross or a dihybrid cross? Give one example of such a cross.
Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor Give the modern name for this 'factor'.
What are the possible blood groups likely to be inherited by children born to a group A mother and a group B father? Explain your reasoning.
Only one of the following characteristic of the parents can be inherited by their children. This one is:
List two differences in tabular form between dominant trait and recessive traits. What percentage/proportion of the plants in the F2 generation/progeny were round, in Mendel's cross between round and wrinkled pea plants?
Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel’s observations giving reasons of F1 and F2 progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments.
Who is the pioneer of modern genetics?
What will be the number of chromosomes present in each gamete produced by the plants if the palisade cells of a species of the plant contain 28 chromosomes in all?
Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F1 progeny are tall. When the tall plants of F1 progeny are crossed, short plants re-appear in F2 progeny.
Reason: Traits are independently inherited.
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are
Name the following:
The basic units of heredity.
