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A pure pea plant having round (R), yellow (Y) seeds is crossed with another pure pea plant having wrinkled (r), green (y) seeds. Subsequently F1 progeny is self-pollinated to obtain F2 progeny. (a) What do the seeds of F1 generation look like? (b) Give the possible combinations of traits in seeds of F2 generation. Also give their ratio. (c) State the reason of obtaining seeds of new combination of traits in F2 generation.
ANSWER: (a) All F₁ seeds are round and yellow. Genotype: RrYy. (b) Gametes from F₁: RY, Ry, rY, ry. F₂ phenotypes and ratio (from a 4×4 Punnett): Round, Yellow = 9/16 Round, Green = 3/16 Wrinkled, Yellow = 3/16 Wrinkled, Green = 1/16 (c) New trait combinations appear in F₂ because of independent assRead more
ANSWER: (a) All F₁ seeds are round and yellow. Genotype: RrYy.
(b) Gametes from F₁: RY, Ry, rY, ry.
F₂ phenotypes and ratio (from a 4×4 Punnett):
(c) New trait combinations appear in F₂ because of independent assortment of the two gene pairs during meiosis (alleles for seed shape and seed colour segregate into gametes independently), producing recombinant genotypes and the 9:3:3:1 phenotypic ratio.
See lessNeha’s uncle is always eating something or the other. He doesn’t have a fixed time table for eating. He eats whatever he gets. Due to which he suffers from heartburn and indigestion. (a) What causes acidity or indigestion of food in adults?
Acidity or indigestion in adults is mainly caused by excessive secretion of hydrochloric acid in the stomach, irregular eating habits, overeating, or eating too much spicy and oily food. This irritates the stomach lining and causes discomfort.
Acidity or indigestion in adults is mainly caused by excessive secretion of hydrochloric acid in the stomach, irregular eating habits, overeating, or eating too much spicy and oily food. This irritates the stomach lining and causes discomfort.
See lessDiscuss the role of the pancreas and bile juice in the digestion of food in human beings.
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for compleRead more
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for complete digestion.
See less“The length of the small intestine in various animals depends on the food they eat.” Justify the statement.
Herbivores like cows and rabbits eat plant food, which is rich in cellulose and hard to digest, so they have a longer small intestine for complete digestion and absorption. Carnivores like tigers and lions eat protein-rich, easily digestible food, so they have a shorter small intestine.
Herbivores like cows and rabbits eat plant food, which is rich in cellulose and hard to digest, so they have a longer small intestine for complete digestion and absorption. Carnivores like tigers and lions eat protein-rich, easily digestible food, so they have a shorter small intestine.
See lessA student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
ANSWER: [A] Explanation: Correct option: (a) The near point of his eyes has receded away. The student can clearly see the blackboard but cannot read his textbook, which means he suffers from hypermetropia (farsightedness). In this defect, the near point of the eye shifts farther away than normal, maRead more
ANSWER: [A]
Explanation: Correct option: (a) The near point of his eyes has receded away. The student can clearly see the blackboard but cannot read his textbook, which means he suffers from hypermetropia (farsightedness). In this defect, the near point of the eye shifts farther away than normal, making nearby objects appear blurred.
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