29개의 결과 중 1 - 5개
But I am strongly inclined to suspect that the most frequent cause of variability
may be attributed to the male and female reproductive elements having been
affected prior to the act of conception. Several reasons make me believe in this ;
These remarks are of course confined to the first appearance of the peculiarity,
and not to its primary cause, which may have acted on the ovules or male
element ; in nearly the same manner as in the crossed offspring from a short-
horned cow ...
The carrier, more especially the male bird, is also remarkable from the wonderful
develop ment of the carunculated skin above the head, and this is accompanied
by greatly elongated eyelids, very large external orifices to the nostrils, and a ...
It is also a most favourable circumstance for the production of distinct breeds, that
male and female pigeons can be easily mated for life ; and thus different breeds
can be kept together in the same aviary. I have discussed the probable origin of ...
cases, victory will depend not on general vigour, but on having special weapons,
confined to the male sex. A hornless stag, or spurless cock would have a poor
chance of leaving offspring. Sexual selection by always allowing the victor to ...
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