Final answer:
Microarray analysis is the most useful and efficient technique for comparing gene-expression patterns in mouse embryogenesis. It involves hybridization between nucleic acid sequences and allows for the comparison of gene expression between different cell types and conditions. By measuring the relative amounts of cDNA, researchers can study the effects of developmental stages on gene expression.
Step-by-step explanation:
The most useful and efficient technique for comparing different gene-expression patterns among developmental stages of mouse embryogenesis is microarray analysis. Microarray analysis involves hybridization between complementary nucleic acid sequences and is commonly used to compare gene-expression patterns between different cell types or conditions. Scientists can use microarray analysis to compare gene-expression patterns between cancerous cells and healthy cells, for example. By measuring the relative amounts of cDNA, researchers can study the effects of different developmental stages on gene expression.