Genes a and b are 21 m. u. apart when mapped in highly inbred strain 1 of corn and 21 m. u. apart when mapped in highly inbred strain 2. But when the distance is mapped by testcrossing the F1 progeny of a cross between strains 1 and 2, the two genes are only 1.5 m. u. apart. What arrangement of genes a and b and any potential rearrangement breakpoints could explain these results

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?

What are positive impacts of algae? how is it used?