Question A, B, O blood types in humans demonstrate the phenomena known as co-dominance. The blood Rh factor (+ or -) displays an inheritance pattern of simple dominance. Using the following designations: A as the dominant allele for blood type A, B as the dominant allele for blood type B and o as the recessive allele for blood type O and R as the dominant (+) Rh allele and r as the recessive (-) Rh allele, what are all of the possible genotypes for the following blood types. a) A+
b) O+
c) B-
d) AB-
e) If one parent has the blood type A+ and another parent has O+ blood, what are the possible blood types of their children?

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.