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प्रश्न
Give reasons why acquired characters are not inherited.
उत्तर
Acquired characters are those characters that an organism gets during its lifetime. These characters do not bring any change in the DNA of germ cells so these characters are not inherited. Acquired traits are the changes that occur in non-reproductive tissues, thus they cannot be passed on to DNA of germ cells. Hence, these characters do not produce a change in the genes of germ cells, so they cannot be inherited.
Example : Swimming skills do not have any genetic changes in the individual who knows it. So it cannot pass from one generation to another as genetic code is the only way organisms pass information to the next generation.
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संबंधित प्रश्न
Differentiate between the following -
Homozygous and Heterozygous
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.
Mention whether the cross is a monohybrid or dihybrid.
What is a monohybrid cross? How did Mendel perform this cross?
Name the conditions when both the alleles are identical?
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.
Which type of plants was missing in the F1 generation but reappeared in the F2 generation?
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.
In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?
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.
