In ruminants, horns and antlers are controlled by a gene that occurs in two principle allelic forms. Allele Hn determines no horn and allele Hh determines horn. The interaction of these two alleles in the heterozygote condition is of special interest because in the presence of male hormone, allele Hh is dominant over allele Hn, whereas in the absence of male hormone, allele Hn is dominant over Hh. If a male and female kudu, both with genotype HnHh, have many calves, approximately what percentage of horned females would be expected?

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.