Final answer:
A cross between a heterozygous and a homozygous recessive individual for a trait results in a 1:1 ratio of dominant to recessive trait expression among the offspring.
Step-by-step explanation:
A cross between an individual who is heterozygous for a trait (having one dominant and one recessive allele, symbolized as Aa) and an individual who is homozygous recessive (having two recessive alleles, symbolized as aa) will produce offspring that follow a specific pattern of genetic inheritance. According to Mendelian genetics, this cross will result in offspring with a 1:1 ratio of dominant to recessive trait expressions, where half of the offspring will be heterozygous, exhibiting the dominant trait (Aa), and half will be homozygous recessive, exhibiting the recessive trait (aa).
This outcome is due to the segregation of alleles during gamete formation, where each parent contributes only one allele to their offspring. Subsequently, the heterozygous individual produces gametes with either the dominant or recessive allele, while the homozygous recessive individual only produces gametes with the recessive allele. When these gametes combine during fertilization, they produce offspring with equal probabilities of being either Aa or aa.