You mean histology right??
Histology:
Histology, also microanatomy, is the ponder of the life structures of cells and tissues of plants and creatures utilizing microscopy.
 
        
                    
             
        
        
        
Answer:D
Explanation:
Both parent are Heterozygous for the sickle cell allele. 
Both parent have sickle cell trait in which the both posses one abnormal allele of the hemoglobin beta gene (AS heterozygous genotype) 
When two AS parents mate, probability of giving birth to a sickle cell anemia child is 1/4
AS + AS= AA, AS, AS, SS
 
        
             
        
        
        
By it alleles, and there genes what one plant have the other may not have see it all depends on the out come of the alleles-genes that they come up with .
 This shouldd helpp broo .