Multiple Choice
Which part of the sex chromosome is responsible for holding sister chromatids together during cell division?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
Multiple Choice
In angiosperms, which of the following is correctly paired with its chromosome count?
A
Egg cell: n
B
Endosperm: 2n
C
Pollen grain: 2n
D
Zygote: 3n
Verified step by step guidance1
Recall the basic chromosome numbers in angiosperm reproduction: 'n' represents the haploid number (one set of chromosomes), and '2n' represents the diploid number (two sets of chromosomes).
Understand the chromosome count of the egg cell: since it is a gamete formed by meiosis, it contains a haploid set of chromosomes, so its chromosome number is 'n'.
Analyze the pollen grain: it is also a male gametophyte and contains haploid cells, so its chromosome number should be 'n', not '2n'.
Consider the zygote: it forms after fertilization when the haploid egg and haploid sperm fuse, resulting in a diploid cell with chromosome number '2n'.
Examine the endosperm: it is typically triploid (3n) in angiosperms because it forms from the fusion of one sperm nucleus with two polar nuclei, so its chromosome number is '3n', not '2n'.
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