Concept explainers
Figure 26.8 At what stage dees the diploid zygote form?
- when the female cone begins to bud from the tree
- at fertilization
- when the seeds drop from the tree
- when the pollen tube begins to grow
Introduction:
A cell with a single set of chromosomes is known as haploid while the one with two sets of chromosomes is known as a diploid cell. Most of the cells in higher organisms are diploid except for the gametes that part in fertilization.
Answer to Problem 1VCQ
Correct answer:
The correct answer is option (b).
Explanation of Solution
Explanation for the correct answer:
Option (b) is given as fertilization. Fertilization is the process of fusion of male and female gamete to form a zygote. The gametes have a single set of chromosome and as they fuse the number of chromosomes in the zygote doubles and it becomes diploid. Hence, option (b) is correct.
Explanation for the correct answer:
Option (a) is given as when the female cone begins to bud from the tree. The female cone is diploid and if formed from a sporophyte leaf. Hence, option (a) is incorrect.
Option (c) is given as when the seeds drop from the tree. The seeds are already diploid as they contain an embryo that has formed from the developing zygote. Hence, option (c) is incorrect.
Option (d) is given as when the pollen tube begin to grow. The pollen tube develops from the intine of the pollen grain which is haploid so is the tube. Hence, option (d) is incorrect.
A diploid zygote is formed as a result of fusion of two haploid gametes during fertilization. The male and female gametes are haploid cells containing a single set of chromosomes while a zygote is diploid and contain a pair of each chromosome.
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