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1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

3. Extensions to Mendelian Inheritance

Sex Chromosome

Genetics

3. Extensions to Mendelian Inheritance

Sex Chromosome

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Multiple Choice

In angiosperms, which of the following is correctly paired with its chromosome count?

Egg cell: n

Endosperm: 2n

Pollen grain: 2n

Zygote: 3n

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Verified step by step guidance

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'.