
Introduction:
The DNA act as a genetic material which carries information that passes to the next generation. The DNA includes genes and every gene contains a pair of alleles. The DNA present in the nucleus divided into chromosomes (a long strand of DNA).

Answer to Problem 1FIB
Correct answer:
The physical position of a gene on a chromosome is called its locus. Alternative forms of a gene are called alleles. These alternative forms of genes arise as mutations, which are changes in the
Explanation of Solution
DNA is a long strand structure which is present in form of the chromosome in the nucleus of cells. In DNA many genes are present, which gets translated into specific proteins. The physical position of a gene in the chromosome is called as locus.
Allele is the alternate form of the gene which means the gene has at least two variations. The variation of a gene can be more than two. The allele occupies the same position on the homologous chromosome and often classified as recessive or dominant.
The different alleles present on the chromosomes are inherited from both parents (mother and father). These alleles are arising from mutations. Mutations cause the change in DNA nucleotide sequences. If a mutation occurs in germ cells then it can be passed from one generation to another
The physical position of a gene is called locus. Alternative form of a gene is called as alleles. These alleles are arising due to mutation.
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