Heredity and Variation

Heredity and Variation

Students often do not understand the critical role of variation to evolutionary processes. In fact, variation is the only fundamental requirement for evolution to occur. Natural selection is often erroneously perceived to have this role; however, natural selection is a mechanism of evolution (one of several), while variation is a prerequisite for evolution. In other words, there can be evolutio...

Marriage and Heredity

Mydriasis and heredity.

Routine ophthalmoscopy and fundoscopy of 673 individuals revealed 42 whose irides failed to dilate to a clinically useful degree within 25 to 30 min after the administration of drops of 1% mydracil. These individuals occurred with different frequency among the Aymara, Mestizo, and non-Aymara groups which made up the sample of examinees. The phenomenon was most common among the Aymara, less comm...

Heredity and Mental Diseases

Lecture, on heredity in relation to mental disease and mental deficiency by Sir Frederick Mott, and also the obituary notice of the distinguished author. The lecture is an important contribution to the problem of insanity and mental deficiency. Sir Frederick opened his lecture by asking whether the increase in the number of registered cases of insanity is due to a raising of the standard of men...

Blood Groups and Heredity

that go to make the differ eSj such a and another, as very feVyT ( . digital m genital cataract, alkaptonu i'ur of the irl ' Nation, and probably the c.. lines. stated to run upon Mendelian .g dlfficUlt The subject of human her^ ̂ is, &t a and hence investigation R?tly anothe ?aiV8 speed. Only very character has been added t n and H11. blood group factor. Von Dung'er ̂ agglutinins ^ld have conclu...