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British geneticist R.C. Punnett develope...

British geneticist R.C. Punnett developed a graphical representation of gentic cross called "Punnett Square". Mention the possible result this representation predicts of the genetic cross carried.

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### Step-by-Step Solution: 1. **Understanding the Punnett Square**: The Punnett Square is a graphical tool used to predict the outcome of a genetic cross. It is structured like a checkerboard, where the alleles from one parent are listed along the top and the alleles from the other parent are listed along the side. 2. **Types of Genetic Crosses**: The Punnett Square can be used for various types of genetic crosses: - **Monohybrid Cross**: Involves one trait (e.g., flower color). - **Dihybrid Cross**: Involves two traits (e.g., flower color and plant height). - **Test Cross**: Used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual. ...
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Assertion :- Punnett sequare is a graphical representation to calculate the probability of all possible genotypes of offsprings in a genetic cross. Reason :- It was developed by a British geneticist, Raginald C. Punnett.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parenal characters. i) Work out the cross with the help of a Punnett square. ii) Name the type of the cross carried out.

The graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross is called a) Pedigree analysis b) Karyotype c) Punnett square d) Chromosome map

Select the option with correct set of statements for Punnett square. (a) Developed by a British geneticist. (b) Used to calculate the probability of genotypes of offsprings. (c) Useful for monohybrid crosses only. (d) It is a mathematical formula which helps to calculate the types of gametes.

Select the option with correct set of statements for Punnett square. (1) Developed by British geneticist. (2)Used to calculate the probability of genotypes offsprings. (3)Useful for monohybrid crosses only. (4) It is a mathematical formula which helps to calculate the types of gametes.

A currrent I is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n. (a) Find the drift velocity v of the electrons. (b) If a magnetic field B exists in the region as shown in what is the average magnetic force on the free electrons? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length. This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will be the potential diference developed across the width of the conductor due to the electron- accumulation? The appearance of a transverse emf, when a current-carrying wire is placed in a magnetic field, is called hall effect.

The punnett square shown below represents the pattern of inheritance in dihybrid cross, when round (R) is dominant over wrinkled (r) seeds and yellow (Y) is dominant over green (y) seeds : Find out the odd one :

Consider a uniform wire of length l . Cross-sectional area A, Young's modulus of the material of the wave is Y. Some information related to the wire is given in column-1 and dependence of the result is given in column-2. Then match the approprite choice between the columns and match the list given in options {:("Column-I"" ""Column-II"),("(A) Let us suspend wire vertically from a"" ""(p) Young'sModulus" ),("rigud support and attach a mass m at"),("its lower end. If the mass is slightly pulled"),("down and released, it executes S.H.M"),("of a time period which will depend on"),("(B) Work done in stretching the wire up to length"" ""(q) elongation (x)"),(l+x "will depend on"),("(C) If the given is fixed between two rigid"" ""(r) length (l)"),("supports and its temperature is decreased"),("thermal stress that develops in the wire"),("will depend on"),("(D) If the wire is pulled at its ends equal and"" ""(s) area of cross-section (A) "),("opposite forces of magnitude F so that it"),("undergoes an elongation x, according to"),("Hook's law, F=kx, where k is the force"),("constant.Force constant (k) of the wire"),("will depend on"):}

Using punnett square show the F_2 results of a dihybrid cross where the pure breed parents have contrasting traits with reference to seed shape and seed colour in Pisum Sativum. Give the phenotypic ratio.

XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SECTION-A
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  2. A human being suffering from Down's Syndrome shows trisomy of 21^(st) ...

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  3. Pea flowers produce assured seed sets. Give a reason.

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  4. British geneticist R.C. Punnett developed a graphical representation o...

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  5. State the two principal outcomes of the experiments conducted by Louis...

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  7. What are 'flocs', formed during secondary treatment of sewage ? OR ...

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  8. At what stage does the meiosis occur in an organism exhibiting haploid...

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  9. Mention two objectives of-setting up GEAC by our Government.

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  10. Write the palindromic sequence that EcoRI recognises.

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  11. Trace the route of Sporozoite of Plasmodium when it enters the human b...

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  12. List any two characters of Pea plants used by Mendal in his experiment...

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  13. Name the disorder caused due to the absence of one of the X-chromosome...

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  14. Write one difference between binary fission and budding.

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  15. Mention two objectives of-setting up GEAC by our Government.

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  16. Write the palindromic sequence that EcoRI recognises.

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  17. Trace the route of Sporozoite of Plasmodium when it enters the human b...

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  18. List any two characters of Pea plants used by Mendel in his experiment...

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  19. Name the disorder caused due to the absence of one of the X-chromosome...

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  20. Write one difference between binary fission and budding.

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