Heredity and sex . /?•;•:??©:©?•?::;-:©.©.©. @^/ Fig. 32. — Diagram illustrating the irregular distribution of the chro-mosomes in dispermic eggs in an imaginary case with only four kinds ofchromosomes, a, b, c, d. There are here three sets of each of these ineach egg. The stippled cells are those that fail to receive one of eachkind of chromosome. (After Boveri.) produced at the first division of these dispermic eggsmay contain a full complement of the chromosomes,or only some of them. The possibilities for fourchromosomes are shown in the diagram. Any cellthat does not contain at l
Heredity and sex . /?•;•:??©:©?•?::;-:©.©.©. @^/ Fig. 32. — Diagram illustrating the irregular distribution of the chro-mosomes in dispermic eggs in an imaginary case with only four kinds ofchromosomes, a, b, c, d. There are here three sets of each of these ineach egg. The stippled cells are those that fail to receive one of eachkind of chromosome. (After Boveri.) produced at the first division of these dispermic eggsmay contain a full complement of the chromosomes,or only some of them. The possibilities for fourchromosomes are shown in the diagram. Any cellthat does not contain at least these four chromosomesis shaded. One case is present in which all the four 58 HEREDITY AND SEX cells contain a complete assortment. If normal devel-opment depends on an embryo containing in every cellat least one of each kind of chromosome, then inour simple case only one group of four cells has thispossibility. Boveri found that such dispermic eggs producenormal embryos very rarely. H
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
