Quick questions on Population genetics and collaborative data: HSC Biology Module 5

Projects that sequenced thousands of people from populations across every continent built a shared catalogue of allele frequencies. The clear trend is that genetic diversity is highest in African populations and decreases with distance from Africa (shown above). The relationship this reveals is that populations further from Africa descend from progressively smaller migrating groups (each carrying a subset of alleles - a "serial founder effect"), which supports the out-of-Africa model.

Pooling de-identified genetic-screening data lets a health authority measure the carrier frequency of a disease allele across many regions. The pattern that certain recessive alleles are concentrated in particular ancestral populations confirms the inheritance is autosomal recessive and tells health services where to target screening and genetic counselling.

For a threatened species, pooled data from monitored populations and captive-breeding records track the number of different alleles and the genotype frequencies over time. A falling allele count signals loss of genetic diversity from drift and inbreeding; managers then choose breeding pairs or translocations that add alleles and reduce inbreeding.

The dot point uses all three words. In a data question, state the trend (direction over the axis), the pattern (which groups differ) and the relationship (what it implies), and link to the named context (evolution, disease or conservation).

Frequency data is evidence, not proof. Cautious, evidence-based language ("the data supports the out-of-Africa model") reads as Band 6.

For "investigate the use of a large-scale collaborative project", say why pooled data is more reliable (sample size, representativeness, replication) and, for "discuss/evaluate", give a limitation (sampling bias, ethics/privacy, inconsistent methods).

Gene pool, allele frequency, genotype frequency, genetic drift, gene flow, founder effect, carrier frequency, out-of-Africa model. Precise terms separate Band 6 from Band 4.