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You are supplied with two sets of seeds ...

You are supplied with two sets of seeds of pea plants. One set is yellow and round seeds with gene constitution YYRR and other set is green and round seeds with gene constitution yyRR. From both sets of seeds plants are cultivated. Pea plant is self-pollinated but arrange artificial cross between two given plants cultivated from seeds. Which offsprings do you expect ? show with chart.

Text Solution

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In all offsprings, only dominant trait for seed colour and seed shape are expressed.
i.e., All the plants will have yellow and round seeds.
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The Class X students of a secondary school in Krishinagar have been allotted a rectangular plot of land for their gardening activity. Sapling of Gulmohar are planted on the boundary at a distance of 1 m from each other. There is a triangular grassy lawn in the plot as shown in the given figure. The students are to sow seeds of flowering plans on the remaining area of the plot. (1) Taking A as origin, find the coordinates of the vertices of the triangle. (2) What will be the coordinates of the vertices of Delta PQR if C is the origin ? Also calculate the areas of the triangles in these cases. What do you observe ?

When pea plants showing pair of two different characteristics are bred with each other. {:("Characters","Different characteristics"),("1. Height of Plant","Tall and short"),("2. Shape of seed","Round and wrinkled"):} Answer the following questions : What do the progeny of cross made between tall plant with round seeds and a short plant with wrinkled seeds look-like ?

Knowledge Check

  • In the result of Mendel's experiment on the inheritance of two characters, the ratio of the plants showing yellow and wrinkled seeds and of the plants showing green and round seeds in F_(2) generation is …………….....

    A
    `3:3`
    B
    `9:3`
    C
    `3:1`
    D
    `9:1`

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    To observe the response of plant parts to light OR To study phototropism in plants. Materials : Conical flask, wire mesh, cardboard box open from one side, water, two- three freshly germinated bean seeds. Procedure : rarr Fill a conical flask with water. rarr Cover the neck of the flask with a wire mesh. rarr Keep two-three freshly germinated bean seeds on the wire mesh. rarr Take a cardboard box which is open from one side. rarr Keep the flask in the box in such a manner that the open side of the box faces light coming from a window. rarr Observe after two or three days and note down your observation. rarr Now turn the flask and leave it undisturbed in this condition for a few days and then observe. Observation : In the initial position of flask, the shoot bends towards light and roots turn away from light. rarr After turning the flask, position of shoot and roots change, i.e., shoot goes away from light and roots turn towards light but after a few days shoot again shows bending towards light and roots move away from light. What can we conclude from this activity ?

    To observe the response of plant parts to light OR To study phototropism in plants. Materials : Conical flask, wire mesh, cardboard box open from one side, water, two- three freshly germinated bean seeds. Procedure : rarr Fill a conical flask with water. rarr Cover the neck of the flask with a wire mesh. rarr Keep two-three freshly germinated bean seeds on the wire mesh. rarr Take a cardboard box which is open from one side. rarr Keep the flask in the box in such a manner that the open side of the box faces light coming from a window. rarr Observe after two or three days and note down your observation. rarr Now turn the flask and leave it undisturbed in this condition for a few days and then observe. Observation : In the initial position of flask, the shoot bends towards light and roots turn away from light. rarr After turning the flask, position of shoot and roots change, i.e., shoot goes away from light and roots turn towards light but after a few days shoot again shows bending towards light and roots move away from light. Are there differences in the direction of the new growth ?

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