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Work out a cross to find the genotype of...

Work out a cross to find the genotype of a tall pea plant. Name the type of cross.

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To determine the genotype of a tall pea plant, a test cross is made in which the tall pea plant with be crossed with a drawf pea plant.

In case 1. the plant is heterozygous tall and the F ratio between tall and dwarf plants will be 1 : 1. In case 2. the tall plant is homozygous tall and all the offspring will be tall.
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A pure dwart plant was subjected to X-ray treatment,which mutated them to reach the height of a pure tall plant. This new plant was crossed with a hybrid tall. What will be the result of progeny?

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With the help of a cross done with garden pea plants, trace the work done by Mendel with a tall and a short plant to arrive at a 3:1 ratio in the F_(2) generation.

A, B,D are three independently assorting genes with their recessive alleles a, b, d respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Explain the type of genotypes of the offspring produced.

A cross was carricd out between a pure bred tall pea plant and a pure bred dwarf pea plant and F_(1) progeny was obtained. Later, the F_(1) progeny was selfed to obtain F_(2) progeny. Answer the following questions : (i) What is the phenotype of the F, progeny and why? (ii) Give the phenotypic ratio of the F_(2) progeny. (iii) Why is the F_(2) progeny different from the F_(1) progeny?

In a cross between plants with purple flowers and plants with white flowers the offsprings of F_(1) generation all had white flowers. When the F_(1) generation was self-crossed, it was observed in the F_(2) generation that out of 100, 75 flowers were white. Make a cross and answer the following : (i) What are the genotypes of the F_(2) progeny? (ii) What is the ratio of 'White : Purple' flowers in the F_(2) generation?

TRUEMAN BIOLOGY-GENETICS AND EVOLUTION -SECTION-B
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