Lesson 6, Topic 6
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Probability in Gametes

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Topic Content:

• Probability in Gametes
• Application of Probability to the Formation of Gametes
• Application of Probability to the Formation of Offspring in Plants
• Worked Example

The Mendelian monohybrid (3 : 1) and dihybrid (9 : 3 : 3 : 1) ratios are the expected figures based on the assumption that a particular mechanism is operated in the cross under consideration.

However, since these ratios depend on the random union of gametes at fertilization, the results observed in any given cross are unlikely to agree exactly with the ideal ratios expected.

It is therefore necessary to know the amount of deviation (between the observed and the expected values) that is due to chance rather than due to the possibility that the postulated mechanism may not be correct. This test depends on the concept of probability (P) which has a numerical expression of the likelihood that an event will occur.

Probability = $$\frac{\normalsize Number\:of\:times\:an\:event\:occurs}{\normalsize Total\:number\:of\:trials}$$

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