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When four genes are segregating independently in the F₂ generation, the total number of possible genotypes can be calculated by taking 2 to the power of the number of gene pairs. For each gene pair, there are 3 possible genotypes (assuming a simple dominant/recessive model - homozygous dominant, heterozygous, homozygous recessive). Therefore, the total number of genotypes for four independently segregating genes is 34 = 81 Hence, the correct answer is (2) 81.
If the average marks of the three batches 32, 45 and 54 student respectively is 50, 42 and 35, then find the approximate average mark of all the students?
The average age of three children is 20 years. If their ages are in the ratio 1:2:3. Find the age of the youngest child.
