Why are two genes found on the same chromosomes are not always linked forever?

Answer 1

Two genes found on the same chromosome are not always linked forever because of a process called genetic recombination or crossing over. During meiosis, the chromosomes undergo a process where they exchange genetic material, resulting in new combinations of genes. This process occurs during the formation of reproductive cells (sperm and eggs).

Here's a step-by-step explanation:

1. Homologous chromosomes: Each pair of chromosomes in an individual contains one chromosome from each parent. These pairs are called homologous chromosomes.

2. Crossing over: During meiosis, homologous chromosomes pair up and exchange segments of genetic material in a process called crossing over. This results in the mixing and swapping of genes between the chromosomes.

3. Independent assortment: In addition to crossing over, during meiosis, the homologous chromosomes segregate independently into separate cells. This means that the combination of genes from each parent chromosome can vary in the resulting cells.

4. Recombinant chromosomes: As a result of crossing over and independent assortment, new combinations of genes are formed on the chromosomes. These new combinations are called recombinant chromosomes.

The occurrence of crossing over and independent assortment allows for the shuffling of genetic material between chromosomes, leading to genetic diversity and the creation of new combinations of genes. As a result, two genes found on the same chromosome can become separated and inherited independently from each other in subsequent generations.

It's important to note that the likelihood of two genes being separated by crossing over depends on the distance between them on the chromosome. Genes that are closer together on the chromosome are more likely to stay linked and be inherited together, while genes that are farther apart have a higher chance of being separated by crossing over.

In summary, two genes found on the same chromosome are not always linked forever because of genetic recombination during meiosis, which allows for the shuffling and independent inheritance of genes. This process contributes to genetic diversity and the creation of new gene combinations in populations.

Answer 2

genes on the same chromosome come from either the mother or father a child must receive genes from both parents. If it comes from only one parent then this becomes asexual reproduction instead of sexual reproduction.

Answer 3

No it doesn't mean that they are always linked forever because in meiosis during crossing-over the genes are separated and put onto homologous chromosomes.

Answer 4

Crossing-over during meiosis sometimes separates genes that had been on the same chromosome onto homologous chromosomes.