Question

How many types of gametes may be produced by genotype D/d: E/e: F/f?

• A. 27
• B. 8
• C. 3
• D. 6

Answer 1

Answer: (B)

Kinds of gametes may be calculated by following formula:
Number of gametes $=(2{)}^n$ n is number of alleles
Example: D/d: E/e: F/f have trihybrid cross, i.e. n = 3 than
Kind of gametes $=(2{)}^3=2\times 2\times 2=8$

No. of alleles (n)	type of cross	Formula	Kinds of gametes
1	Monohybrid cross	$(2{)}^1=2\times 1$	$2$
2	Dihybrid cross	$(2{)}^2=2\times 2$	$4$
3	Trihybrid cross	$(2{)}^3=2\times 2\times 2$	$8$
4	Polyhybrid cross	$(2{)}^4=2\times 2\times 2\times 2\times$	$16$
5	Polyhybrid cross	$(2{)}^5=2\times 2\times 2\times 2\times 2$	$32$