Table of contents

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

Which of the following chromosome pairings would a normal female duck have?

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Verified step by step guidance

Understand that in birds, including ducks, the sex chromosomes differ from the mammalian system. Instead of XY for males and XX for females, birds use a ZW system where males are ZZ and females are ZW.

Recall that in the ZW system, the female is the heterogametic sex (ZW), meaning she has two different sex chromosomes, while the male is homogametic (ZZ), having two of the same sex chromosomes.

Identify that the options ZZ and XY correspond to male birds and mammals respectively, and XX corresponds to female mammals, not birds.

Recognize that the correct chromosome pairing for a normal female duck is ZW, where Z and W are the sex chromosomes specific to female birds.

Summarize that the key to solving this problem is knowing the difference between mammalian and avian sex chromosome systems and applying that knowledge to identify the correct female duck chromosome pairing as ZW.