Biology Questions and Answers

Biology Questions and Answers

Genetic Concepts

1. What is a gene?

A gene is a sequence of DNA
nucleotidof a protein.es that codifies the production

2. Is a gene a triplet of
   consecutive DNA nucleotides?

A gene is not a triplnucleotides with their respectiveet of DNA (^)
nitrogen-containinCGT. The nucleotidg bases, like AAG ore triplets may be
pieces of genes but not genes.
A gene is a portion of a DNA molecule
that coformed by several DNA nucldifies a specific protein. Teotidehus it is
triplets.

3. How is the concept of
   chromosome related to the
   concept of the gene?

A chromosome chromosome may contain sevis a DNA molecule. Aeral
different genes and also DNA pothat are not genes. rtions

4. What is meant by “gene
   locus”?

Gene locus (locus means place) is the

location oi.e., the position f a gene in a chromosomof the gene in a DNAe, (^)
molecule.

5. What are alleles of a gene?

Diploid individchromosomes. For uals have pairedexample in humans (^)
there are 23 pairs of chromosomes
totaling comprehends homologous46 chromosomes. E ach pair
chromosomes, one chromosome from
the father and another from thboth of them containing informatione moth er,
related to the production of the same
proteins (chromosomes, wwith the exception ohich are partiallyf the sex
heterologous). So in the diploid
individual two alleles, onit is said te in each hat each gene haschromosome of (^)
the homologous pair.

6. Are the alleles of a gene
   necessarily originated one
   from the father and the other
   from the mother? Are there
   exceptions?
   It is natural that allelfrom the father and the other from thees have come one
   mother but it is n“clone” generated by nucleusot obligatory. In a
   transplantation technology, for example,

the alleles come findividual. In polysomiesrom a single (as in trisomy (^)
21) each gene of the affected
chromosome trisomies, or four, in tetrasomies.has three alleles, in
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