Answer Pleiotropy: When a single gene controls two (or more) different traits, it is called pleiotropic gene and this phenomenon is called pleiotropy or pleiotropism. The ratio is 2:1 instead of 3:1. According to Mendel’s principle of unit character, one gene […]
Category: HSC Board Question and Answer
HSC Question and Answer
Why law of independent assortment is not universally applicable?
Answer When the two homozygous parents differing in two pairs of contrasting traits are crossed, the inheritance of one pair is independent of the other. In other words, when a dihybrid forms gametes, assortment (distribution) of alleles of different […]
Why did Mendel select garden pea for his experiments? Explain the characteristics of pea.
Mendel selected garden pea plant (Pisum sativum) for his experiments because of the following characteristics: ii. The flowers are bisexual and naturally self pollinating. iii. They can be artificially cross-pollinated. iv. The offsprings produced after cross pollination are fertile. v. Pea […]
Define the terms: Heredity, Variation & Genetics.
Heredity: The transmission of characters from one generation to the next or from parents to offsprings is called heredity. Variation: The differences between parents and offsprings or among the offsprings of the same parents and among individuals of the same species is […]
Distinguish between crystalline solids and amorphous solids. Give examples.
Distinguish between crystalline solids and amorphous solids Property Crystalline solids Amorphous solids 1. Shape They have definite characteristic geometrical shape due to the orderly regular long range arrangement of constituent particles. They have irregular shape and lack characteristic geometrical shape […]
What is a unit cell? Explain Bravais lattices.
unit cell i. A unit cell is the smallest repeating structural unit of a crystalline solid. A crystalline solid can be obtained by repeating the unit cells (of the same crystalline substance) in space in all directions. ii. The lines […]
Write a note on: Diamond , Graphite & Fullerene
Diamond: a. Diamond is an allotrope of carbon. It is used in jewellery and is the most precious crystal. b. Covalent bonds between sp3 hybridized carbon atoms continue in all directions to form a giant network. c. Diamond is very […]