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A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be
[1989, 2004]
- a)tetraploid
- b)triploid
- c)diploid
- d)pentaploid
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
A diploid female plant and a tetraploid male plant are crossed. The pl...
Crossing a diploid female plant and a tetraploid male plant results in a triploid zygote. The endosperm, which nourishes the developing embryo, is formed by the fusion of two polar nuclei with a sperm cell, resulting in a triploid (3n) endosperm.
Explanation:
- Ploidy of the female plant: Diploid (2n)
- Ploidy of the male plant: Tetraploid (4n)
During fertilization, the haploid sperm cell from the male plant fuses with the haploid egg cell from the female plant to form a diploid zygote (2n). However, in angiosperms, the endosperm is formed by the fusion of two polar nuclei with a sperm cell, resulting in a triploid (3n) endosperm.
In this case, the male plant is tetraploid, which means it has four sets of chromosomes. During meiosis, the tetraploid plant will produce gametes with two sets of chromosomes (2n), which can fuse with the haploid gametes from the female plant to form a triploid (3n) zygote.
Since the endosperm is formed by the fusion of two polar nuclei with a sperm cell, which in this case is haploid (n), the ploidy of the endosperm will be triploid (3n) as well.
Therefore, the correct answer is option A: tetraploid.
Explanation:
- Ploidy of the female plant: Diploid (2n)
- Ploidy of the male plant: Tetraploid (4n)
During fertilization, the haploid sperm cell from the male plant fuses with the haploid egg cell from the female plant to form a diploid zygote (2n). However, in angiosperms, the endosperm is formed by the fusion of two polar nuclei with a sperm cell, resulting in a triploid (3n) endosperm.
In this case, the male plant is tetraploid, which means it has four sets of chromosomes. During meiosis, the tetraploid plant will produce gametes with two sets of chromosomes (2n), which can fuse with the haploid gametes from the female plant to form a triploid (3n) zygote.
Since the endosperm is formed by the fusion of two polar nuclei with a sperm cell, which in this case is haploid (n), the ploidy of the endosperm will be triploid (3n) as well.
Therefore, the correct answer is option A: tetraploid.
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Community Answer
A diploid female plant and a tetraploid male plant are crossed. The pl...
If male plant is tetraploid its gametes would be diploid .when these diploid gametes fuse with 2 polar nuclei of the embryo sac the resultant endosperm would be tetraploid.thats why option A is correct.
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A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be[1989, 2004]a)tetraploidb)triploidc)diploidd)pentaploidCorrect answer is option 'A'. Can you explain this answer?
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