39
Reproductive cells are haploid (have 1/2 the chromosomes), whereas somatic/body cells are diploid (have the full set of chromosomes)
This makes sense if you think about it. Using the example from the question, every dog has 78 chromosomes. This includes two of each (there are two chromosome 1's, two chromosome 2's, etc. This is visible in the karyotype attached). One set of these chromosomes were inherited from the mother, and one set from the father. Each parent contributed 39 chromosomes (one chromosome 1, one chromosome 2, etc.). If the dog in the question were to have 78 chromosomes in its sperm cells, it would contribute two sets to its offspring. When combined with the chromosomes in the egg cell, the offspring would end up with extra chromosomes. Therefore, both the sperm and the egg cells will have 39 chromosomes, one of each. When combined, they will produce offspring with 78 chromosomes, the proper number. 
 
        
                    
             
        
        
        
Answer:
biotic and abiotic interactions
on gradpoint
Explanation:
 
        
                    
             
        
        
        
What happens to the population density and competition if the birth rate decreases? 
The birth rate would increase is the population density competition increased. 
Hope I helped. 
        
                    
             
        
        
        
Answer:
           The correct option is c ( <span>sexual reproduction joins two cells that each have half the total chromosome number).
Reason:
              Meiosis occurs only in reproductive cell in which the number of chromosome reduce to half. This phenomenon is very imoportant and essential for maintaining the number of chromosomes in species.</span><span />
        
                    
             
        
        
        
Answer:
Gap Junctions.
Explanation:
Gap junctions are intercellular channels that allows the cell transfer of molecules, ions and electric impulses.
They are connected through the protein channel and are found in many parts of vertebrate and invertebrate nervous systems.
Its most important function is to control the activities of adjacent cells.