Question

if an organism with the genotype aabb produces gametes, what proportion of the gametes would be bb? view available hint(s) 1/2 3/4 1/4 none

Explanation:

Step1: Recall gamete formation rules

Gametes are formed by the segregation of alleles during meiosis. For a diploid organism with genotype \( AaBb \), each gamete receives one allele from each gene (Mendel's law of segregation and independent assortment). So, for the \( A/a \) gene, alleles segregate into \( A \) or \( a \), and for \( B/b \), into \( B \) or \( b \). A gamete will have one allele from \( A/a \) and one from \( B/b \), like \( AB \), \( Ab \), \( aB \), \( ab \). A gamete cannot have two alleles for the same gene (like \( Bb \)) because during meiosis, homologous chromosomes (carrying the two \( B/b \) alleles) separate, so each gamete gets only one allele per gene.

Step2: Determine the proportion

Since gametes can only have one allele for the \( B/b \) gene (either \( B \) or \( b \), not both), the number of gametes with genotype \( Bb \) is zero.

Answer:

None (the option with "None")