Living organisms : an account of their origin & evolution / by Edwin S. Goodrich.

  • Edwin Stephen Goodrich
Date:
1924
Catalogue details

Licence: In copyright

Credit: Living organisms : an account of their origin & evolution / by Edwin S. Goodrich. Source: Wellcome Collection.

    13/214 (page 3)
    3 IV. VARIATION AND THE FACTORS OF INHERITANCE; DETERMINATION OF SEX Modifiability, p. 63. Johannsen’s experiments, p. 63. Pure lines, p. 66. Darwin’s provisional theory of Pangenesis, p. 66. Weismann’s theory of inheritance inadequate, p. 68. Mendel’s researches, p. 68. Laws of heredity, p. 69. Segregation of factors, p. 71. Homozygotes and heterozygotes, p. 73. Dominance, p. 74. Factors of inheritance, p. 76. Mendelian inheritance, p. 80. Re¬ version, p. 82. Crossing of races and species, p. S3. Kinds of mutation, p. 84. Their origin, p. 84. Factors borne by chromo¬ somes, p. 86. Evidence of Cytology, p. 89. Nature of factors, p. 89. Epigenesis and ‘evolution’, p. 90. Development and differentiation, p. 94. Origin of factorial changes, p. 95. Produc¬ tion and control of mutations, p. 96. Determination of sex, p. 97. V. THE STRUCxGLE FOR EXISTENCE AND NATURAL SELECTION Struggle for existence, p. 103. Reproduction of organisms, p. 103. Competition, p. 104. Increase held in check, p. 105. Natural Selection acts like a sieve, p. 106. Direction of Evolution determined by environment, p. 107. Objections, p. 107. Adapta¬ tion, p. 109. Selective death-rate, p. 110. Disease, p. 113. Effect of selection, p. 115. Ancestral inheritance, p. 117. Domestic races, p. 117. Regression, p. 118. Continuous and discontinuous variation, p. 119. Variation not adaptive, p. 122. Usefulness of characters, p. 123. Correlation, p. 124. Animal coloration, p. 125. Persistence of mutations, p. 127. VI. ISOLATION AND SEXUAL SELECTION Divergence a result of Isolation and Selection, p. 12S. Geographi¬ cal Isolation, p. 128. Parasitic isolation, p. 130. Physiological isolation, p. 130. Sterility, p. 131. Secondary sexual characters, p. 13X. Sexual Selection, p. 132.