f heredity

Physical Basis of Heredity - According to Mendel, the genotype is made of certain structures called factors. The factors controlled the inheritance of all traits. These factors are present in pairs. The factors are now called genes. Thus the physical basis of heredity are the ge..

According to Mendel, the genotype i.e., the combination of genes or the genetic constitution is made of certain structures called factors. The factors controlled the inheritance of all traits. These factors are present in pairs. The factors are now called genes. Thus the physical basis of her..

a. a continuous demand - clamour b. to respect and approve - admire c. returning something to its mineral state - restore d. related to heredity - genetic f. with exactness - precisi..

It is a cross involving two pairs of contrasting characters. For this experiments on dihybrid inheritance. Mendel selected the contrasting characters in the seed coat and cotyledons. He conducted a cross pollination between a pure breeding plant with round seed coat and yellow coloured cotyledons a..

Test Cross - Mendel devised a system of conducting verification for the results obtained by him. It is known as test cross. It is a cross between F1 plant and the recessive parent. A test cross-conducted for the monohybrid inheritance results in the two opposite characters expressing in a..

In the plant Mirabilis jalapa, commonly called as four'o clock plant, the inheritance of flower colour is an example for incomplete dominance. The plant produces two types of flowers red coloured and white coloured. This condition is an example for a pair of contrasting characters. When a plant whi..

fig. 18.8 Plants with Axial and Terminal Flowers Similar results were obtained with reference to all the pairs of contrasting characters. Based on these results, Mendel came to the conclusion that in a cross-involving two contrasting characters, only one character expresses itself in the next gener..

Quantitative Inheritance - It is a pattern of inheritance where a single phenotypic trait is governed by more than one pair of genes. Hence, there is formation of many possible genotypes as a result of which such traits show a wide range of phenotypes. Such a trait is called polygenic or multifacto..

Epistasis - Epistasis is the best example for gene interaction. It is a pattern of inheritance where a pair of genes situated at one locus, prevent the expression of a pair of genes situated at another locus. Such genes are called inhibiting genes or epistatic genes (Epi = above/over gene, static =..