. Adventures with animals and plants. Biology. Fig. 1 2 3 408 Reduction division of a female pri- mary sex cell. How many chromosomes in the pri?nary sex cell? In each daughter cell? Com- pare the chromosomes in male and fejnale re- duction Fig. 409 Except for the egg cells the mother hippopotaynus produces, all the cells ifz the mother have the sojne number and kinds of chro7nosomes. How are the eggs different? The cells of the child formed from a fertilized egg will have the same chromosome number as the cells of each parent. Why? (national zoological park) Try Exercise 5 to revie
. Adventures with animals and plants. Biology. Fig. 1 2 3 408 Reduction division of a female pri- mary sex cell. How many chromosomes in the pri?nary sex cell? In each daughter cell? Com- pare the chromosomes in male and fejnale re- duction Fig. 409 Except for the egg cells the mother hippopotaynus produces, all the cells ifz the mother have the sojne number and kinds of chro7nosomes. How are the eggs different? The cells of the child formed from a fertilized egg will have the same chromosome number as the cells of each parent. Why? (national zoological park) Try Exercise 5 to review the three steps in maturation of sperms. In females, when the primary sex cell goes through reduction division, produc- ing the haploid nuclei, the cytoplasm divides unequally. Thus one daughter cell is large, the other small. In the mi- totic division that follows, the large daughter cell again divides unequally. In this way, of the four cells that are pro- duced by these two divisions, one is large and three are tiny. Only one cell sur- vives, the large one. This becomes the egg. It, like the sperm, has onlv one of each pair of chromosomes and only a single set of genes because of the reduc- tion division. In some animals large amounts of food material, called yolk, accumulate in the egg cell, making it very large. Fish and frog eggs, and, par- ticularly, bird eggs are good examples of this. Fertilization and chromosome number. You have just read how the sperm and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
Size: 2113px × 1182px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
