Evolutionary Novelties and Trends PDF

Evolutionary Novelties (진화적 신형) • Many complex structures have evolved in increments from simpler versions that performed the same basic function (많은 복잡한 구조는 동일한 기본 기능을 수행하던 단순한 버전에서 점차 발전해 왔다) • The simplest eyes are patches of light-sensitive photoreceptor ce...

Evolutionary Novelties (진화적 신형) • Many complex structures have evolved in increments from simpler versions that performed the same basic function (많은 복잡한 구조는 동일한 기본 기능을 수행하던 단순한 버전에서 점차 발전해 왔다) • The simplest eyes are patches of light-sensitive photoreceptor cells (가장 단순한 눈은 빛에 민감한 광수용체 세포로 이루어진 패치이다) Figure 23.23 A Range of Eye Complexity Among Molluscs (연체동물에서 눈의 복잡성의 범위) Copyright © 2021 Pearson Education Ltd. All Rights Reserved Evolutionary Trends (진화의 경향) • Apparent trends must consider all fossils, even those belonging to extinct lineages (명백한 추세는 멸종된 혈통에 속하는 화석을 포함한 모든 화석을 고려해야 함) – For example, a trend toward large, single-toed species can be shown in the horse lineage, but only if extinct species from the fossil record are excluded (예를 들어, 말의 혈통에서 발가락이 하나뿐인 큰 종을 향한 경향을 볼 수 있지만, 화석 기록에서 멸종된 종을 제외해야만 볼 수 있다) Figure 23.26 The Evolution of Horses (말의 진화) Copyright © 2021 Pearson Education Ltd. All Rights Reserved Evolutionary Trends (2 of 2) • The species selection model suggests that differential speciation success may determine evolutionary trends • Evolutionary trends do not imply an intrinsic drive toward a particular phenotype • Evolution results from interaction between organisms and their current environments Copyright © 2021 Pearson Education Ltd. All Rights Reserved Copyright © 2021 Pearson Education Ltd. All Rights Reserved HHMI Video: Animated Life: Pangea, Wegener, and Continental Drift Copyright © 2021 Pearson Education Ltd. All Rights Reserved