Given below is a schematic diagram showing Mendel-s Experiment on sweet pea plants having axial flowers with round seeds AARR and terminal flowers with wrinkled seedsaarr- Study the same and answer the questions that follow- -5 MARKS-Terminal Wrinkleda Give the phenotype of F1 progeny-b Give the phenotypes of F2 progeny produced by the self-pollination of F 1 progeny-c Give the phenotypic ratio of F2 progeny-d Name and explain the law induced by Mendel on the basis of the above observation-

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Biology

Mendel's Dihybrid Experiments

Given below i...

Question

Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds(aarr). Study the same and answer the questions that follow: [5 MARKS]

(a) Give the phenotype of F1 progeny.
(b) Give the phenotypes of F2 progeny produced by the self-pollination of F1 progeny.
(c) Give the phenotypic ratio of F2 progeny.
(d) Name and explain the law induced by Mendel on the basis of the above observation.

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Solution

a) 1 Mark
b) 2 Marks
c) 1 Mark
d) 1 Mark

(a) All plants have axial flowers and round seeds.
(b)

Phenotypes of $F_{2}$ progeny
(i) Plants with axial flowers and round seeds.
(ii) Plants with axial flowers and wrinkled seeds.
(iii) Plants with terminal flowers and wrinkled round seeds.
(iv) Plants with terminal flowers and wrinkled seeds.

(c) Phenotypic ratio - 9:3:3:1

(d) Law of Independent Assortment: When there are two pairs of contrasting characters, the distribution of the members of one pair into the gametes is independent of the distribution of the other pair.

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Similar questions

A cross was made between pure breeding pea plants, one with round and green seeds and the other with wrinkled and yellow seeds.

(a) Write the phenotype of

F_{1}

progeny. Give reason for your answer.

(b) Write the different types of

F_{2}

progeny obtained along with their ratio when

F_{1}

progeny was selfed.

Q. A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds: [5 MARKS]
(a) Give the scientific name of the plant on which Mendel conducted his hybridisation experiments.
(b) Give the genotype of the F1 generation.
(c) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(d) Name and state the law which explains the dihybrid ratio.
(e) Give the possible combinations of gametes that can be obtained from F1 hybrid.

Q. Application based questions.
A true breeding pea plant homozygous for axial violet flowers is crossed with another pea plant with terminal white flowers
What would be the phenotype and genotype of F1 and F2 generations?

Q. Five Mark Questions :
(a) A true breeding homozygous Pea plant with green pods and axial flowers as dominant characters is crossed with a recessive homozygous Pea plant with yellow pods and terminal flowers. Work out the cross upto

F_{2}

generation giving the phenotypic ratios of

F_{1}

and

F_{2}

generations respectively.
(b) State the Mendelian principle which can be derived from such a cross and not from monohybrid cross.

A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F₁ plants are self pollinated, a total of 1600, F₂ plants are produced. In the same experiment how many $F_{2}$ plants show $F_{1}$ phenotype?

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