Question

If a dihybrid pea plant, heterozygous for flower colour (red dominant over white) and seed shape (round dominant over wrinkled) under goes selfing, the types of gametes produced are

• A. 2
• B. 4
• C. 8
• D. 16

Answer 1

The correct option is B 4

A total number of types of gamete produce by an organism is $2^n$, where n is the number of heterozygous genes present. Since given plant is heterozygous for two genes (flower colour and seed shape), thus total possible gametes by it = $2^2$=4. Similarly, dihybrid, trihybrid and tetrahybrid plants are heterozygous for two, three and four genes respectively, thus total possible gametes= $2^2$, $2^3$ and $2^4$=4, 8 and 16 respectively. Thus, the correct answer is option B.