EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 52.3, Problem 1R
Summary Introduction
To review:
The reason that for the development of default pathway for sexual behavior in female rats.
Introduction:
Hormones have a considerable role in development of sex organs and expression of sexual behavior in females as well as males. The development and expression of the sexual behaviors depend on the level of sex hormones released during adulthood.
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EBK LIFE: THE SCIENCE OF BIOLOGY
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- How does sexual motivation differ among animal species?arrow_forwardIf you 1) inject a drug that blocks the action of testosterone into a male rat pup 2) then stopped the drug in adult hood and 3) then injected testosterone, which of the following is likely to happen? a) The adult develops female reproductive organs. b) The adult displays normal male-typical sex behaviors. c) The adult has impaired male-typical sex behaviors. d) The adult displays female-typical sex behaviors.arrow_forwardWhat determines sex in birds, reptiles, humans, ants, and bees?arrow_forward
- Describe what sexual dimorphism is and why its existence is puzzling.arrow_forwardWhat is Sexual Dimorphism and its examples? What are the causes and effects of Sexual Dimorphism?arrow_forwardWhy does the mode of fertilization correlate with thepresence or absence of male parental care?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_forwardGive three examples of female sexual selection for ornamentation in males and explain how preference for males with these ornaments increases the reproductive success of the female.arrow_forwardWhat prevents an individual from mating with itself?arrow_forward
- Which of the following is true about sex determination in mammals? Choose all possible answers. a.) The conversion of the genital ridge into the bipotential gonad requires the Sf1, Wt1, and Lhx9 transcription factors. b.) Even if one of the transcription factors mentioned in choice a (Sf1, Wt1, and Lhx9) will lose its function, the normal development of either male or female gonads will still push through. c.) Sry protein binds to the enhancer of the Sox9 gene and elevates expression of this key gene in the ovary-determining pathway. d.) β-catenin functions to initiate the ovarian pathway of development by activating the genes involved in granulosa cell differentiation. e.) Sf1 protein prevents the production of Sox9.arrow_forwardMale parental care occurs in only 7% of fishes and amphibianspecies with internal fertilization but in 69% of species with externalfertilization. Propose an explanation for why this is so.arrow_forwardAll of the following are correct about asexual reproduction EXCEPT a) it can create numerous offspring quickly b) the offspring are genetically identical to the parent c) it enables animals living in isolation to produce without a mate d) it is advantageous when the environment is changing and the organisms is stressed.arrow_forward
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