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Recessive genetic disorders result from inheriting 2 defective recessive alleles of gene ( one from each parent ). The x - chromosome holds about 10% of all human genes. Sex chromosomes are: males XY, females XX. Y-traits occure in males only. Y-disorders are rare.
Answer: Most recessive disorders are on the Autosomal recessive gene, and thus not x-linked.
Answer:
During the development of the fetus, the mechanism by which the mammalian skeletal system gives rise to tissues of the bone is termed as endochondral ossification. Endochondral ossification also plays an essential role at the time of the development of the long bones length, rudimentary generation of the long bones, and healing of bone fractures naturally.
The following are the steps in the process of endochondral ossification:
f. The development of the cartilage model.
b. The calcification of cartilage takes place and the formation of bone collar occurs.
a. In the diaphysis, the formation of the ossification center takes place.
c. In the epiphysis, the formation of ossification centers takes place.
d. Replacement of cartilage takes place by the bone.
e. Ossification of epiphyseal plates takes place.
Answer: It could be true
Explanation: Stanford students can view Satellite images
