heredity%3b

Question: Heredity or inheritance of specific traits became clearer due to 1. Lamarck's theory 2. Mendel worked on garden peas 3. Darwinism 4. Neo-Darwinism Answer: ..

It is a double stranded molecule with each strand being made up of many nucleotide units. Each nucleotide is made up of a nitrogenous base, a sugar molecule and a phosphoric acid molecule. Nitrogenous bases are of two kinds: purines pyrimidines The nitrogenous bases present in DNA are adenine and g..

>It was possible to conduct cross pollination by transferring pollen grains from one plant to another. Following table represents the contrasting characters, which Mendel was able to identify in the pea plants. fig. 18.6 - Mendel's Monohybrid Traits During his observation on the pattern of inherita..

They are faecal pellets that contain evidences of the food eaten. For example, teeth and scales. The oldest fossil-bearing rocks contain fossils of few organisms that were simple. However, the younger rocks contain more fossils and these fossils show more complex structure. This indicates that the..

. The phenomenon is rarer among plants (where it is called parthenocarpy) than among animals. Unusual patterns of heredity can occur in partheogenetic organisms. For example, offspring produced by some types are identical in all inherited respects to the moth..

Charles Darwin proposed the theory of Pangenesis, according to which tiny particles are formed in different parts of the body. These particles migrate to the gametes and from there to the offspring where they guide the formation of the respective parts. Darwin, called these particles as pangenes o..

The plants developing from callus have shown large variations in their characters. Such variations are called somaclonal variations. Such variations occur as a part of mutation or as a part of clonal development. As these variations are not due to heredity, their transmissions to next gen..

They are faecal pellets that contain evidences of the food eaten. For example, teeth and scales. The oldest fossil-bearing rocks contain fossils of few organisms that were simple. However, the younger rocks contain more fossils and these fossils show more complex structure indicating that the comp..

Sex Determination - During the formation of gametes, the females will have only one type of gametes, all with one X chromosome. However, the males will produce two types of gametes or sperms, half with X chromosome and half with Y chromosome. Thus the sex of a zygote is determined by which male gam..

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 ratio of ..