# DBT JRF 2020 — Question 44

Exam: DBT JRF 2020 · Section: B · Topic: Plant Biology · Difficulty: Easy

## Question

Which part of a plant would be most suitable for raising virus-free plants for micropropagation?

## Options

- **A.** bark
- **B.** apical meristem
- **C.** node
- **D.** vascular tissue

## Answer

Option B

## Explanation

For a genotype with $n$ heterozygous loci (Aa Bb Cc ... each independently assorting), the number of genetically distinct gamete types = $2^n$ . Genotype AaBbCcDdEeFfGg has 7 heterozygous loci: $2^7 = 128$ possible gamete combinations. Each locus contributes two allele options (e.g. Aa contributes A or a gametes). This is a direct application of the fundamental counting principle for independent events in Mendelian genetics.

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