The effect of natural selection to eradicate genes for progeria and cystic fibrosis. Introduction: Natural selection is the process through which fitter organisms are selected from the population, for survival, by some natural means. This results in the eradication of negative genes and causes variation in a number of chromosomes. It is summed up in one line as ‘survival of the fittest’.

Question

Of the following, which is the least plausible hypothesis for why natural selection has not eliminated genes for male homosexuality? a. Perhaps the relatives of a homosexual male have more than an average number of children. b. Homosexual people might spread their genes by helping their brothers and sisters rear their children. c. Maybe there is no gene for homosexuality. Instead, an environmental event produces an epigenetic effect that can be transmitted from one generation to the next. d. Some homosexual men have children.

Answer 1

Question

Chapter 13, Problem 14TYK

Summary Introduction

To review:

The effect of natural selection to eradicate genes for progeria and cystic fibrosis.

Introduction:

Natural selection is the process through which fitter organisms are selected from the population, for survival, by some natural means. This results in the eradication of negative genes and causes variation in a number of chromosomes. It is summed up in one line as ‘survival of the fittest’.

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Of the following, which is the least plausible hypothesis for why natural selection has not eliminated genes for male homosexuality? a. Perhaps the relatives of a homosexual male have more than an average number of children. b. Homosexual people might spread their genes by helping their brothers and sisters rear their children. c. Maybe there is no gene for homosexuality. Instead, an environmental event produces an epigenetic effect that can be transmitted from one generation to the next. d. Some homosexual men have children.

Gregor Mendel never saw a gene, yet he concluded that some inherited factors were responsible for the patterns of inheritance he observed in peas. Similarly, maps of Drosophila chromosomes (and the very idea that genes are carried on chromosomes) were conceived by observing the patterns of inheritance of linked genes, not by observing the genes directly. Is it legitimate for biologists to claim the existence of objects and processes they cannot actually see? How do scientists know whether an explanation is correct?

Gregor Mendel never saw a gene, yet he concluded that some inherited factors were responsible for the patterns of inheritance he observed in peas. Similarly maps of Drosophila chroma zones were conceived by observing the patterns of inheritance of linked genes, not by observing the genes directly. Is it legitimate for biologists to claim the existence of objects and processes they cannot actually see? How do scientists know whether an explanation is correct?