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Question
A typical gymnosperm plant has 8 chromosomes in leaf cells. What will be number of chromosomes in the cells of its gametophyte?
A typical gymnosperm plant has 8 chromosomes in leaf cells. What will be number of chromosomes in the cells of its gametophyte?
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Solution
The correct option is C 4
In gymnosperm, the seeds develop either on the surface of scales or leaves, which are then modified to form cones. While these like all seed plants have a sporophyte-dominant life cycle, the gametophyte bearing phase is short lived. Where there is the presence of such alternation of generation, the multicellular gametophyte is generally haploid with n number of chromosomes and the sporophytic generation is diploid with 2n chromosomes. Hence, if the leaf cells have 8 chromosomes, the gametophyte would have 4 chromosomes.
Therefore, the correct answer is option C.
In gymnosperm, the seeds develop either on the surface of scales or leaves, which are then modified to form cones. While these like all seed plants have a sporophyte-dominant life cycle, the gametophyte bearing phase is short lived. Where there is the presence of such alternation of generation, the multicellular gametophyte is generally haploid with n number of chromosomes and the sporophytic generation is diploid with 2n chromosomes. Hence, if the leaf cells have 8 chromosomes, the gametophyte would have 4 chromosomes.
Therefore, the correct answer is option C.
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