Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 55, Problem 2CQ
Summary Introduction
To describe: The reason for differential male parental care among the amphibians and fishes.
Introduction: Parental care is needed to ensure the survival of the young ones. The newly born offsprings require parental care until they are developed. This care includes protection from predators and providing food. Some species also teach their offsprings to fly and fight.
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we discuss various mechanisms of sex determination, including the XX/XY system of placental mammals, and the ZZ/ZW system of birds. Monotremes, the most primitive mammals, have a very intriguing sex determination scheme that shares elements of both of these systems.
Please use the internet to learn more about how sex in monotremes is determined. Then write a short essay (300-400 words) describing this system and comparing/contrasting it to the XX/XY and ZZ/ZW systems.
Chapter 55 Solutions
Biology
Ch. 55.1 - Prob. 1CCCh. 55.1 - Core Skill: Connections Look ahead to Figure...Ch. 55.1 - Prob. 2CSCh. 55.1 - Cuckoos lay their eggs in other birds nests, so...Ch. 55.2 - Prob. 1CCCh. 55.2 - Prob. 1EQCh. 55.2 - Prob. 2EQCh. 55.2 - Prob. 3EQCh. 55.2 - Prob. 2CCCh. 55.5 - Prob. 1CC
Ch. 55.6 - Prob. 1CCCh. 55.7 - Core Skill: ModelingThe goal of this modeling...Ch. 55 - Prob. 1TYCh. 55 - Prob. 2TYCh. 55 - Prob. 3TYCh. 55 - Prob. 4TYCh. 55 - Prob. 5TYCh. 55 - Prob. 6TYCh. 55 - Prob. 7TYCh. 55 - Prob. 8TYCh. 55 - In ants, which employ a haplodiploid mating...Ch. 55 - Prob. 10TYCh. 55 - Prob. 1CQCh. 55 - Prob. 2CQCh. 55 - Prob. 3CQCh. 55 - Prob. 1COQCh. 55 - Prob. 2COQ
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- Uniquely explain the relationship between primate mating groups and sexual dimorphism in your own words.arrow_forwardSome marine fishes exhibit a spectacular polyphenism, in that individuals can, under special circumstances, change their sex from female to male (in other species, the switch goes from male to female). This developmental change involves reproductive organs, hormones, and mating behavior (Warner 1984). In some species, the removal of a dominant, breeding male from a cluster of females triggers a sex change in the largest female present. Identify the apparent developmental restrictions imposed on this system, such as the requirement that a female be transformed into a male rather than some sort of intermediate sex. Speculate on the benefits associated with each restriction.arrow_forwardAnimals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following. (a) The animals are small in size and want to produce more offsprings. (b) Food is available in plenty in water. (c) To ensure better chance of fertilisation. (d) Water promotes production of large number of gametes.arrow_forward
- Explain the chromosomal and genetic control of sex determination in mammals. Clearly establish the difference between the primary and the secondary phases.arrow_forwardMy college Bio teacher asked me this question in response to one of my photos I posted on Facebook: "I wonder why some birds exhibit sexual dimorphism while others do not." Can someone explain this phenomenom in detail?arrow_forwardCan you an example of species in the Philippines that has been documented to perform parthenogenesis?arrow_forward
- Clownfish are protandrous hermaphrodites. Determine whether the following features are encoded by the clownfish genome or are influenced by the proteome in response to the environment. The juvenile clownfish has both male and female immature reproductive organs. Clownfish are able to produce both testosterone and 17-estradiol. Genome encoded Increased estradiol levels lead to increased levels of proteins that promote the growth of female sex organs. Increased testosterone levels lead to increased - levels of proteins that cause male sex organs to develop Proteome influencedarrow_forwardDiscuss the process and pathways of fertilzation in turtles. Also provide or show a diagram how does fertilization occur in female turtlesarrow_forwardBecause the reproductive success of female Hanuman langurs (Semnopithecus entellus) is almost certainly lowered when a newly installed male kills their young infants, selection should favor countermeasures against infanticidal males. In this light, why might already pregnant females mate with a new male soon after a takeover even though they are not ovulating? What significance do you attach to the discovery that when mares are impregnated by stallions at stables away from their home locations, they will also copulate repeatedly with the males in their home stables upon their return?arrow_forward
- In some species, sex is determined by environmental, rather than genetic, factors. This is true of: kangaroos humans turtles birds beesarrow_forwardEnumerate and give at least 5 unique mechanisms employed by organisms in order to determine the sex of the offspring. In each case, give an example of a species which represent such a scheme of producing sex(y) descendants. Put reference Mechanism Example 1 2 3 4 5 What evolutionary forces drive the turnover of these sex determination mechanisms?arrow_forwardwhat is the chromosomal system for determining sex in mammals?arrow_forward
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