How are traits passed from parents to offspring?

Traits are passed from parents to offspring through genes, which are segments of DNA located on chromosomes. These genes carry instructions that determine physical and functional characteristics.

Each individual inherits two copies of each gene—one from the mother and one from the father.

How traits are inherited:

1. Presence of genes on chromosomes
Genes are located on chromosomes in the nucleus. Each gene controls a specific trait.

2. Formation of gametes (meiosis)
During gamete formation (sperm and egg), the number of chromosomes is halved, and each gamete carries only one allele for each gene.

3. Fertilization
When sperm and egg fuse, the offspring receives one allele from each parent, restoring the pair of alleles.

4. Expression of traits

• If one allele is dominant, it masks the recessive allele

• If both alleles are the same, the trait is expressed accordingly

5. Role of variation
Different combinations of alleles result in variation among offspring.

6. Influence of environment
Some traits are also affected by environmental factors, not just genes.

Example:
If one parent contributes allele T (tall) and the other contributes t (short), the offspring (Tt) will be tall due to dominance.

In simple terms: Traits are inherited through genes passed from both parents, and their combination determines how traits appear in offspring.