Question

Main postulate of chromosomal theory

Answer 1

Answer:

The factors described by Mendel are the genes that are the actual physical units of heredity

So there are mainly two postulates of chromosomal theory

(i)The genes are present on the chromosomes in a linear fashion.

(ii)Each organism has a fixed number of chromosomes which occur in two sets referred to as diploid (2n).

Answer 2

Answer:

Boveri and Sutton proposed the chromosomal hypothesis of inheritance in the early 1900s. It is the most basic concept in genetics. Genes are the units of inheritance, according to this hypothesis, and they are located in chromosomes.

Explanation:

Chromosomal Theory of Inheritance Postulates:

• The genes, which are the physical units of inheritance, are the factors defined by Mendel.
• The genes are arranged in a linear pattern on the chromosomes.
• Each organism has a fixed number of chromosomes that are divided into two sets, known as diploids (2n). The homologus pair is made up of two chromosomes that are quite identical.
• One set comes from the male father (paternal), while the other comes from the female parent (maternal).
• During zygote formation, the egg and sperm contribute maternal and paternal chromosomes, respectively. However, only the sperm nucleus is involved, demonstrating the presence of chromosomes within the nucleus.