The first step in sexual reproduction is gamete formation. In this step, the number of chromosomes gets halved. Thus, each gamete receives half the number of chromosomes to that of somatic cells. During fertilisation, the fusion of male and female gametes takes place, which results in the number of chromosomes in the zygote to be equal to that of somatic cells. Thus, the chromosomal number of the sexually producing parents and their offspring is the same.
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Introduction:
The chromosomal number of the sexually producing parents and their offspring is the same. This is a fundamental principle in genetics and is known as the law of equal segregation. It is based on the process of meiosis, which ensures the continuity of the chromosomal number across generations. Let's explore the details of this statement and understand how it is justified.

The process of meiosis:
Meiosis is a specialized type of cell division that occurs in the reproductive cells (gametes) of sexually reproducing organisms. It consists of two consecutive divisions known as meiosis I and meiosis II. The primary goal of meiosis is to reduce the chromosomal number by half, ensuring that the offspring receive the correct number of chromosomes.

Equal segregation:
During meiosis, the chromosomes replicate and pair up to form homologous pairs. Each homologous pair consists of one chromosome inherited from the mother and one from the father. These pairs align on the metaphase plate during meiosis I and then separate, with one member of each pair going into each daughter cell. This process is known as the law of equal segregation.

Formation of gametes:
After the completion of meiosis I, each daughter cell undergoes meiosis II to further divide. This results in the formation of four haploid cells, known as gametes. Each gamete contains half the number of chromosomes as the parent cell. In humans, for example, the gametes (sperm and egg cells) contain 23 chromosomes each.

Fusion of gametes:
During sexual reproduction, two gametes (one from each parent) fuse together to form a zygote. The zygote then develops into an offspring. Since each gamete contains half the chromosomal number of the parent cells, the zygote formed by their fusion will have the same chromosomal number as the parents.

Conclusion:
In conclusion, the statement that the chromosomal number of the sexually producing parents and their offspring is the same is justified by the process of meiosis. Meiosis ensures equal segregation of chromosomes, leading to the formation of gametes with half the chromosomal number. When these gametes fuse during sexual reproduction, the resulting offspring inherits the same chromosomal number as the parents. This principle of equal segregation and the continuity of chromosomal number is a fundamental aspect of genetics.