Question

The bighorn sheep (Ovis canadensis) is a species of sheep native to North America named for its large horns. These horns can weigh up to 14 kg (30 lb), while the sheep themselves weigh up to 140 kg (300 lb). The sheep live in harems, groups of one male and multiple females. Populations of bighorn sheep have inhabited Alberta, Canada for thousands of years. In bighorn sheep, males fight each other by banging their large horns together and males that win these contests control harems of females. Horn size in males is primarily influenced by a gene called HRN. There are 2 alleles, H1 and H2. H1 produces larger horns and H2 produces small horns. The alleles show an incomplete dominance inheritance pattern. Scientists measured horn size of male sheep in a population of bighorn sheep in 1950. Which of the following is the best figure legend/caption for this figure Since 1950, there is evidence of genetic change in the population of Bighorn sheep. Recently, male sheep horns are getting smaller--up to 25% smaller. We know trophy hunters pay high license fees for the opportunity to hunt males with large horns and hunting has increased since 1950. What would a curve of horn size data look like in 2020 that would show the potential impact to horn size after many generations of significant hunting pressure compared with the original curve shown in previous questions?

Which of the following is the best figure legend/caption for this figure? A frequency distribution of horn size in male sheep in 1950 O Growth curve of male sheep horn beginning in 1950 Genotypic variation of horn size in male sheep in 1950 Changes in allele frequency of horn size alleles from 1950 to present Question 4 (1 point) Saved Since 1950, there is evidence of genetic change in the population of Bighorn sheep. Recently, male sheep horns are getting smaller--up to 25% smaller. We know trophy hunters pay high license fees for the opportunity to hunt males with large horns and hunting has increased since 1950. What would a curve of horn size data look like in 2020 that would show the potential impact to horn size after many generations of significant hunting pressure compared with the original curve shown in previous questions? The new curve would shift to the right showing larger horn size. The new curve would shift to the left showing smaller horn size. There would be no change in horn size. The new curve could stabilize in medium range for horn size.

Answer 1

Answer:

The best caption would be

(d) changes in allele frequency of horn size alleles from 1950 to present.

Since the study is about the allelic frequencies and distributions in 1950 and is also based on current events ,this is the most suitable caption.

4. The new curve could stabilize in medium range for horn size.

The sexual selection will not select the ones with shorter horns , however the larger horns will also be unavailable due to poaching. So there would be a selection of medium ranged horns(incomplete dominance) as they will be both available and preferable in absence of large horns.

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