In the context of genetics, each spermatid and ovum produced during gametogenesis contains:

• A. two alleles for each gene
• B. one allele for each gene
• C. no alleles for any gene
• D. four alleles for each gene

Answer: (B)

Verified step by step guidance

1. Understand the process of gametogenesis: Gametogenesis is the process by which gametes (sperm and ova) are formed. This involves meiosis, a type of cell division that reduces the chromosome number by half, ensuring that gametes are haploid (contain one set of chromosomes).
2. Recall the concept of alleles: Alleles are different versions of a gene. In diploid organisms, each individual has two alleles for each gene, one inherited from each parent. During gametogenesis, these alleles are segregated.
3. Apply Mendel's Law of Segregation: According to Mendel's first law, during meiosis, the two alleles for each gene separate so that each gamete receives only one allele for each gene. This ensures that the gametes are haploid.
4. Analyze the options: Since gametes (spermatids and ova) are haploid, they contain only one allele for each gene. This eliminates the options 'two alleles for each gene,' 'no alleles for any gene,' and 'four alleles for each gene.'
5. Conclude the correct answer: Based on the principles of meiosis and Mendel's Law of Segregation, each spermatid and ovum produced during gametogenesis contains 'one allele for each gene.'