Q23-3TYU - Campbell Biology

Question

If the nucleotide variability of a locus equals 0%, what is the gene variability and number of alleles at that locus?

(A) gene variability = 0%; number of alleles = 0

(B) gene variability = 0%; number of alleles = 1

(C) gene variability = 0%; number of alleles = 2

(D) gene variability 7 0%; number of alleles = 2

Step-by-Step Solution

Answer

1. The option ‘gene variability = 0%; number of alleles = 0’ is false.

2. The option ‘gene variability = 0%; number of alleles = 1’ is true.

3. The option ‘gene variability = 0%; number of alleles = 2’ is false.

4. The option ‘gene variability = 7 0%; number of alleles = 2’ is false.

Step 1: Nucleotide

The field of genetics describes nucleotide as an organic compound formed through nucleoside phosphorylation and comprises the association of phosphate, a pentose sugar, and a nitrogen base.

Step 2: Explanation of option (A)

In genetics (study of heredity), the functional DNA segment that has the union of nucleotides necessary to instruct cells responsible for determining the organism’s appearance and survival in the environment is called a gene.

Thus, the gene with no genetic variation consists of one allele.

Therefore, the given option is false.

Step 3: Explanation of option (B)

The gene’s scientific study, such as genetics, defines alleles as the gene’s alternative form necessary for determining a single trait in a living organism.

Thus, when nucleotide variability is zero, gene variability will be the same and obtained by comparing the nucleotide sequence of individuals of the same population with one allele.

Therefore, the given option is true.

Step 4: Explanation of option (C)

The term ‘locus’ represents the specific gene’s position on a thread-like DNA structure, such as a chromosome.

Thus, the gene is made up of one allele.

Therefore, the given option is false.

Step 5: Explanation of option (D)

The distinct kinds of functions related to genes are instructing the cell to make protein during translation and are instructing cells for their working and growth.

Thus, based on given nucleotide variability, gene variability must be the same.

Therefore, the given option is false.