Diastrophic dysplasia- Is an inherited autosomal recessive manner. D represents the normal allele and d represents the mutant. Achondroplasia- Inherited in an autosomal dominant manner A represents the mutant allele and a represents the normal allele. AA individuals do not survive embryogenesis. Both of these make the person small Matt has Diastrophic dysplaisa who is the father. The mother has Achondroplasia- whose family has no history of Diastrophic dysplaisa (assume they are not carriers) They have a son who is also small is it because ofDiastrophic dysplaisa or Achondroplasia. How do you know? Solution The genotypes of the parents are (Mother) AaDD X aadd (Father) Their offspring will be AaDd- who will be exhibiting the character Achondroplasia as it is autosomal dominant.

1. Discuss how bones are classified according to shape. Given at least one example of a bone in
each shape category. Describe the microscope structure of compact bone. How does the
structure of compact bone differ from the structure of spongy bone? Identify the bones that
comprise the axial skeleton. What are the primary functions of red bone marrow and In which
bones is red bones marrow ?
Solution
(1)
Types of Bones
Long bones, Example: Femur (leg bone) and Tibia (leg bone)
Short bones Example:Scaphoid bone (wrist bone), Lunate bone (wrist bone)
Flat bones, Example:Cranial bones
Irregular bones, Example Sphenoid bone
Sesamoid bones Example patella