Biology
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:
(i) Give the phenotype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of progeny.
(iii) Give the phenotypic ratio of F2 progeny.
(iv) Name and explain the law induced by Mendel on the basis of the above observation.
Genetics
ICSE 2013
4 Likes
Answer
(i) The phenotype of F1 progeny will be Axial Round as it is dominant phenotype.
(ii) The phenotypes of F2 progeny will be Axial Round, Axial Wrinkled, Terminal Round and Terminal Wrinkled as in F2 generation, recessive trait is also expressed.
(iii) Phenotypic ratio of F2 progeny will be 9:3:3:1.
(iv) Above observation are based on Law of Independent Assortment. This law states that factors or genes controlling different characters assort independently without influencing each other during the formation of gametes.
Answered By
2 Likes
Related Questions
Differentiate between the following pairs on the basis of what is mentioned in brackets :
(i) Photolysis and Photophosphorylation. (Definition)
(ii) Bicuspid valve and Tricuspid valve. (Function).
(iii) Vasectomy and Tubectomy. (Explain)
(iv) Cerebrum and Spinal cord. (Arrangement of nerve cells)
(v) Bowman's capsule and Malpighian capsule. (Parts included)
Draw a diagram of the human eye as seen in a vertical section and label the parts which suits the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) strucutre which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eye ball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outer most transparent layer seen in front of the eye ball.
Complete the following table by filling in the blanks from 1 to 10 with appropriate terms.
S.No. Gland Secretion Function/Effect on body 1 Thyroid 1 2 2 3 Vasopressin 4 3 5 6 Promotes glucose utilization by the body cells 4 Lacrimal gland 7 8 5 Adrenal medulla 9 10 The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow:
(i) Name the phase.
(ii) Label the parts 1, 2, and 3
(iii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iv) Draw well labelled diagrams of part 1 and 2 to show the structural differences between them.