Question

Taking a suitable example, frame a monohybrid cross using a dominant and recessive gene, based on Mendel’s experiments. Also, draw the Punnett square to identify the phenotypic and genotypic ratio for the same and record the observations made in F1 and F2 generations. Pls this is urgent

Answer 1

Answer:

Mendel studied the garden pea (Pisum sativum) for two main reasons. First, peas were available from seed merchants in a wide array of distinct shapes and colors that could be easily identified and analyzed. Second, peas can either self (self-pollinate) or be cross-pollinated. The peas self because the male parts (anthers) and female parts (ovaries) of the flower—which produce the pollen containing the sperm and the ovules containing eggs, respectively—are enclosed by two petals fused to form a compartment called a keel (Figure 2-1 ). The gardener or experimenter can cross (cross-pollinate) any two pea plants at will. The anthers from one plant are removed before they have opened to shed their pollen, an operation called emasculation that is done to prevent selfing. Pollen from the other plant is then transferred to the receptive stigma with a paintbrush or on anthers themselves (Figure 2-2 ). Thus, the experimenter can choose to self or to cross the pea plants.

Figure 2-1. A pea flower with the keel cut and opened to expose the reproductive parts.

Figure 2-1

A pea flower with the keel cut and opened to expose the reproductive parts. The ovary is shown in a cutaway view. (After J. B. Hill, H. W. Popp, and A. R. Grove, Jr., Botany. Copyright © 1967 by McGraw-Hill.)

Figure 2-2. One of the techniques of artificial cross-pollination, demonstrated with the Mimulus guttatus, the yellow monkey flower.

Figure 2-2

One of the techniques of artificial cross-pollination, demonstrated with the Mimulus guttatus, the yellow monkey flower. To transfer pollen, the experimenter touches anthers from the male parent to the stigma of an emasculated flower, which acts as the (more...)

Other practical reasons for Mendel’s choice of peas were that they are inexpensive and easy to obtain, take up little space, have a short generation time, and produce many offspring. Such considerations enter into the choice of organism for any

Answer 2

Explanation:

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