Chapter 42, Problem 1TY

Summary Introduction

Introduction:

Fighting is one of the ways of touch communication between two individuals. This is performed by many species to determine superiority and is influenced by many environmental and internal factors.

Answer to Problem 1TY

Option (d) changes in day length stimulate this behavior.

Explanation of Solution

Explanation/justification for the correct answer:

Option (d) changes in day length stimulate this behavior. The deer are short-day breeders and the estrus begins in females as the day length decreases, So, in order to impress the females, the deers may get into fighting. This behavior is determined by the daylight length which is indicative of the beginning of the cycle.

Explanation for incorrect answer:

Option (a), to determine the supremacy. In the case of deer, the fighting is behavior induced by daylights, but it has no role in supremacy. Hence, it is an incorrect answer.

Option (b) to injure other males to avoid mating with females. The fighting of deer is not associated with injuries. Hence, this is an incorrect answer.

Option (c) to maximize the number of genes they pass on. The fighting behavior does not affect the number of mating and polygamy, so, the genes that generally pass are unaffected. Hence, this is an incorrect answer.

Option (e) fighting help in getting rid of weaker individuals. The fighting is not directly linked to this behavior. So, this an incorrect answer.