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प्रश्न
Explain Mendel’s law of independent inheritance. Give one example.
उत्तर
Mendel’s law of independent assortment states that
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When two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character.
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In a dihybrid cross between two plants having round yellow (RRYY) and wrinkled green seeds (rryy), four types of gametes (RY, Ry, rY, ry) are produced. Each of these segregate independent of each other, each having a frequency of 25% of the total gametes produced.
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संबंधित प्रश्न
State whether the following statement is true or false :
The sex of an infant is not a case of inheritance of characteristics.
Using height (tallness/dwarfness) of a plant as an example, show that genes control the characteristics or traits in an organism.
What is the genotype of tall plants which always produced tall offspring
Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive:
Yellow seed
When two parents are crossed, the offspring are referred to as :
recessives
test cross
F1 generation
F2 generation
Select the statements that describe characteristics of genes :
(i) genes are specific sequences of bases in a DNA molecule.
(ii) a gene does not code for proteins.
(iii) in individuals of a given species, a specific gene is located on a particular chromosome.
(iv) each chromosome has only one gene..
Answer the following question.
Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants? Write the ratio he obtained in F2 generation plants.
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?
Which of the following statement is incorrect?
Mendel crossed pea plants with two pairs of contrasting characters.
| RRYY | × |
rryy |
| Round, Yellow | Wrinkled, Green |
He observed 4 types of combinations in F2 generation. Which of the combinations were new? Write the conclusion drawn by this experiment.
