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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
Place these events in human development in the correct order.
| ____ | 1 | a. gastrulation is completed |
| ____ | 2 | b. blastocyst forms |
| ____ | 3 | c. tail is reabsorbed |
| ____ | 4 | d. implantation occurs |
| ____ | 5 | e. zygote forms |
| ____ | 6 | f. neural tube forms |
| ____ | 7 | g. maternal cervix softens |
To place: The events in human development in the correct order.
1 - e. zygote forms
The gametogenesis occurs in males and females. Males produce sperms and Females produce eggs. During intercourse between a male and female, the maleās sperms are ejaculated into the female reproductive tract. In the oviduct, fertilization takes place. The gametes unite and form the zygote.
2- b. blastocyst forms
The zygote undergoes continuous mitotic divisions that lack G phase and forms the blastocyst. The blastocyst is made up of cells called as blastomeres, its outer covering is called as blastoderm and a cavity that is present inside is called as blastocoel.
3- d. implantation occurs.
The blastocyst travels from the oviducts and reaches the uterus where it embeds into the wall of the uterus called as implantation.
4- a.gastrulation is completed
Post implantation, the blastocyst undergoes gastrulation to form the gastrula...
Chapter 42 Solutions
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