Biology 1001A Lecture Notes - Lecture 21: Egg Cell, Zygote, Meiosis

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Beth Mac Dougall Shackleton Tom Haffie

Document Summary

Naming species: taxonomy the science of the classification of organisms into an ordered system that indicates natural relationships. Linnaeus invented the system of binomial nomenclature, in which species are assigned a. Binomials, however, allow people everywhere to discuss organisms unambiguously: many binomials are descriptive of the organism or its habitat. Linnaeus described and named thousands of species on the basis of their morphological similarities and differences. If phenotype reflects genotype, members of the same gene pool should share genetic traits (genotype) that determine phenotype. The spe(cid:396)(cid:373) a(cid:374)d eggs of ea(cid:272)h spe(cid:272)ies (cid:396)e(cid:272)og(cid:374)ize o(cid:374)e a(cid:374)othe(cid:396)"s (cid:272)omplementary surface proteins but the surface proteins on the gametes of diffe(cid:396)e(cid:374)t spe(cid:272)ies do(cid:374)"t (cid:373)at(cid:272)h. In animals with internal fertilization, sperm of one species may not survive within the reproductive tract of another. If prezygotic isolating mechanisms between two closely related species are incomplete or ineffective, sperm from one species may fertilize an egg of the other species.