How traits get expressed from parents to offsprings? Explain with an example.
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Answer:
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Explanation:
Traits are passed through DNA. When an egg is fertilized with sperm, the resulting offspring takes 50 percent of its DNA from each parent. This resulting combination of two halves of DNA determines what specific traits the child will have. The expression of traits in an offspring is determined by dominant and recessive genes. If one or both parents pass on a dominant gene to the child, then the dominant gene will be expressed. However, a recessive gene is expressed only in case when both parents pass on the recessive genes to the offspring.
For example, in case of eye colour, the gene for brown eyes is dominant and that for blue eyes is recessive. So if either parent passes on the brown eye gene, then it will be expressed in the child. On the other hand for the expression of blue eye trait, both the parents should pass blue color traits. Thus people with blue eyes have two recessive genes, but people with brown eyes can have one dominant and one recessive gene or both dominant genes.
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Traits are passed through DNA. When an egg is fertilized with sperm, the resulting offspring takes 50 percent of its DNA from each parent. This resulting combination of two halves of DNA determines what specific traits the child will have. The expression of traits in an offspring is determined by dominant and recessive genes. If one or both parents pass on a dominant gene to the child, then the dominant gene will be expressed. However, a recessive gene is expressed only in case when both parents pass on the recessive genes to the offspring.
For example, in case of eye colour, the gene for brown eyes is dominant and that for blue eyes is recessive. So if either parent passes on the brown eye gene, then it will be expressed in the child. On the other hand for the expression of blue eye trait, both the parents should pass blue color traits. Thus people with blue eyes have two recessive genes, but people with brown eyes can have one dominant and one recessive gene or both dominant genes.
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