How are new alleles formed?
(A) By crossing over during meiosis
(B) By cloning a new variety in a population
(C) By mutation in the DNA of a gene
(D) By production of a new phenotype from the same DNA - HSC - SSCE Biology - Question 1 - 2009 - Paper 1
Question 1
How are new alleles formed?
(A) By crossing over during meiosis
(B) By cloning a new variety in a population
(C) By mutation in the DNA of a gene
(D) By production o... show full transcript
Worked Solution & Example Answer:How are new alleles formed?
(A) By crossing over during meiosis
(B) By cloning a new variety in a population
(C) By mutation in the DNA of a gene
(D) By production of a new phenotype from the same DNA - HSC - SSCE Biology - Question 1 - 2009 - Paper 1
Step 1
By crossing over during meiosis
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Answer
Crossing over during meiosis is a process that occurs between homologous chromosomes, allowing for genetic recombination. While it increases genetic diversity, it does not form new alleles.
Step 2
By cloning a new variety in a population
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Answer
Cloning creates genetically identical copies of an organism. This method does not introduce new alleles into the gene pool of a population.
Step 3
By mutation in the DNA of a gene
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Answer
Mutations are changes in the DNA sequence that can create new alleles. These changes can occur spontaneously or due to environmental factors and are a primary source of genetic variation.
Step 4
By production of a new phenotype from the same DNA
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Answer
Producing a new phenotype involves expression of the same genetic information but does not alter the DNA sequence itself, thus it does not create new alleles.
