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WABiologyQuick questions
Unit 3: Continuity of Species
Quick questions on Genetic variation and inheritance: WACE Year 12 Biology
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is sex-linked inheritance?Show answer
Genes carried on the sex chromosomes show sex-linked patterns. Most are X-linked. Because males have only one X (XY), a single recessive allele on the X is expressed, so X-linked recessive conditions such as red-green colour blindness and haemophilia are more common in males. Females (XX) need two copies to show the recessive phenotype but can be unaffected carriers.
What is sources of genetic variation?Show answer
Inheritance models shuffle existing alleles, but variation has deeper sources.
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