An organism has genotype Aa Bb CC Dd. How many different types of combinations are possible for gamete formation?
Correct answer: C. 8
- A. 2
- B. 4
- C. 8
- D. 16
Explanation
To determine the number of different types of gamete combinations, examine each gene locus: A, B, and D are heterozygous, meaning they each have two alleles that can segregate, while C is homozygous. Thus, the possible combinations are calculated as 2 x 2 x 1 x 2 = 8. Option A underestimates the number of combinations by considering only one variable locus. Option B partly accounts for the variability but misses one heterozygous locus. Option D overestimates by treating all loci as variable, which is incorrect as locus C is not variable. Therefore, the correct answer is Option C, with 8 combinations.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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