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Some of the earliest examples of parent-offspring conflict were seen in bird broods and especially in raptor species. While parent birds often lay two eggs and attempt to raise two or more young, the strongest fledgling takes a greater share of the food brought by parents and will often kill the weaker sibling ().
Answers to NYT's The Mini Crossword for Tuesday, January 14, 2025. Don't go any further unless you want to know exactly what the correct words are in today's Mini Crossword.
[1] [2] Recent genetic research, including paleogenetics, has increasingly delineated the kinship groups involved in this movement. According to the widely held Kurgan hypothesis , or renewed Steppe hypothesis, the oldest Indo-European migration split from the earliest proto-Indo-European speech community (archaic PIE) inhabiting the Volga ...
As the figure shows, each time that the mouse with the desired trait (in this case the lack of a gene (i.e. a knockout), indicated by the presence of a positive selectable marker) is crossed with a mouse of a constant genetic background, the average percentage of the genetic material of the offspring that is derived from that constant ...
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Genetic variation can be identified at many levels. Identifying genetic variation is possible from observations of phenotypic variation in either quantitative traits (traits that vary continuously and are coded for by many genes, e.g., leg length in dogs) or discrete traits (traits that fall into discrete categories and are coded for by one or a few genes, e.g., white, pink, or red petal color ...
Genetic incompatibility describes the process by which mating yields offspring that are nonviable, prone to disease, or genetically defective in some way. In nature, animals can ill afford to devote costly resources for little or no reward, ergo, mating strategies have evolved to allow females to choose or otherwise determine mates which are more likely to result in viable offspring.
Patrilineality, also known as the male line, the spear side [1] or agnatic kinship, is a common kinship system in which an individual's family membership derives from and is recorded through their father's lineage.