it is said that each parent during sexual reproduction contribute only one set of gene for a particular trait . justify.
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Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell. Today, most scientists agree that genes correspond to one or more DNA sequences that carry the coding information required to produce a specific protein, and that protein in turn carries out a particular function within the cell. Scientists also know that the DNA that makes up genes is packed into structures called chromosomes, and that somatic cells contain twice as many chromosomes as gametes.
According to this theory, male flies should always inherit male characteristics by virtue of inheriting the "male" chromosome (denoted Y); likewise, female flies should always inherit "female" chromosomes (denoted X), which means that these flies should not display male characteristics. Thousands of matings had convinced the Morgan lab that white eyes were clearly a characteristic associated with only the Y chromosome.
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