Willy Be�ak

X-autosome ratio and the behavior pattern of individual X-chromosomes in placental mammals

Susumu Ohno, Willy Be�ak, Maria Luiza Be�ak · Chromosoma · 1964 · 180 citations

Chromatin, Embryology, Developmental Biology +11

The comparative DNA content of 19 species of placental mammals, reptiles, and birds

Niels B. Atkin, Gail Mattinson, Willy Be�ak et al. · Chromosoma · 1965 · 145 citations

Phylogenetics, Molecular Ecology, Molecular Evidence +12

Close karyological kinship between the reptilian suborder serpentes and the class aves

Willy Be�ak, Maria Luiza Be�ak, H. R. S. Nazareth et al. · Chromosoma · 1964 · 115 citations

Morphological Evidence, Kin Recognition, Phylogenetics +8

Cytological evidence of constant tetraploidy in the bisexual South American frog Odontophrynus americanus

Maria Luiza Be�ak, Willy Be�ak, Maria Nazareth Rabello · Chromosoma · 1966 · 115 citations

Biology, Morphological Evidence, Constant Tetraploidy +6

Chromosomal uniformity in the avian subclass Carinatae

Susumu Ohno, C. Stenius, L.C. Christian et al. · Chromosoma · 1964 · 100 citations

Genetic Diversity, Natural Sciences, Genetics +6