Question

Zygote is diploid in which life cycle? \[ \begin{aligned} I. &\text{Haplontic}\\ II. &\text{Diplontic}\\ III. &\text{Haplodiplontic}\\ IV. &\text{Diplohaplontic} \end{aligned} \] The correct answer is (and = all, only = only)

• A. I, II and III only
• B. III and IV only
• C. I, II, III and IV
• D. I, II and IV only

Hint:

Regardless of the life cycle, \[ \boxed{ n+n \longrightarrow 2n } \] Therefore, the zygote is always diploid.

Answer 1

The Correct Option is C

Step 1: Recall the formation of a zygote. A zygote is formed by the fusion of two haploid gametes. Hence, \[ \boxed{\text{The zygote is always diploid (2n).}} \]

Step 2: Check each life cycle. In all the given life cycles, \[ \boxed{ \begin{aligned} &\text{Haplontic} &\text{Diplontic} &\text{Haplodiplontic} &\text{Diplohaplontic} \end{aligned} } \] the zygote formed is diploid.

Step 3: Choose the correct option. Therefore, \[ \boxed{\text{I, II, III and IV}} \] are correct. Hence, the correct option is \[ \boxed{(C).} \]