New alleles arise in a sexually reproducing population by
A - VCE - SSCE Biology - Question 14 - 2007 - Paper 1
Question 14
New alleles arise in a sexually reproducing population by
A. mutations in DNA sequences prior to meiosis.
B. random fertilisation of gametes during reproduction.
C. ... show full transcript
Worked Solution & Example Answer:New alleles arise in a sexually reproducing population by
A - VCE - SSCE Biology - Question 14 - 2007 - Paper 1
Step 1
A. mutations in DNA sequences prior to meiosis.
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Answer
This option refers to genetic mutations, which are the primary source of new alleles in a population. Mutations can occur due to errors during DNA replication or environmental factors. These mutations introduce new genetic variation, which can be passed on to the next generation if they occur in gametes.
Step 2
B. random fertilisation of gametes during reproduction.
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Answer
While random fertilization contributes to genetic diversity in the offspring by combining alleles from two parents, it does not create new alleles. This process shuffles existing alleles rather than generating new ones.
Step 3
C. random assortment of homologous chromosomes during meiosis.
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Random assortment does lead to genetic variation by distributing maternal and paternal chromosomes randomly into gametes. However, like option B, it does not create new alleles; it only mixes existing alleles.
Step 4
D. exchange of chromatin between homologous chromosomes during meiosis.
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This process, known as crossing over, can lead to new combinations of alleles but does not itself create new alleles. It allows for the exchange of genetic material between homologous chromosomes, resulting in variation within the existing alleles.
