Chromosomes exchange genetic material in step 3. 
<h3><u>Explanation</u>:</h3>
The meiosis is the type of cell division that takes place for gametogenesis. The meiosis has two phases - meiosis I and meiosis II.
The meiosis I has the events like crossing over and independent assortment which leads to the mixing of genes between homologous chromosome pairs and separation of homologous chromosome pairs. So the two cells that are produced from the meiosis I are genetically different. The step 3 shows the crossing over of prophase 1 of meiosis I. So, it shows the genetic difference between the offsprings and leads to genetic variation. 
 
        
                    
             
        
        
        
Answer:
c
Explanation:
Random distribution of the Isopods should be 50/50 in A and B.
Chi-square =  where O = observed frequency and E = expected frequency
 where O = observed frequency and E = expected frequency
Chamber         O                    E             Chi-square
   A                   18                   10              = 6.4
 = 6.4
   B                    2                    10              = 6.4
 = 6.4
<em>Total Chi-square </em>= 6.4 + 6.4 = 12.8
<em>Degree of freedom</em> = 2 - 1 = 1
<em>Tabulated Chi-square</em> (α = 0.05) = 3.8415
The calculated Chi-square exceeds the critical value, hence, it is significant and not due to random.
<em>The correct option is </em><em>c</em><em>.</em>
 
        
             
        
        
        
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Answer:
The time required for the colony to grow two million bacteria is 29.22.
Explanation:
Time required for the colony to grow can be calculated by the following equation:

Here t is time, N = 2 million  (require bacteria population).

t ≈ 29.22
Time taken by bacteria to grow is 29.22.