How many genetically distinct gametes are produced if crossing over does not take place during meiosis in an organism with a diploid number of 4?

• A. 8
• B. 2
• C. 4
• D. 16

Answer: (C)

Verified step by step guidance

1. Understand that the diploid number (2n) of the organism is 4, which means there are 2 pairs of homologous chromosomes.
2. Recall that during meiosis, homologous chromosomes are separated into different gametes. Each pair of homologous chromosomes can assort independently.
3. Use the formula for calculating the number of genetically distinct gametes: \(2^n\), where \(n\) is the number of pairs of homologous chromosomes.
4. Since the diploid number is 4, there are 2 pairs of homologous chromosomes (\(n = 2\)).
5. Calculate the number of genetically distinct gametes using the formula: \(2^2 = 4\).