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

2. Mendel's Laws of Inheritance

Monohybrid Cross

Genetics

2. Mendel's Laws of Inheritance

Monohybrid Cross

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Multiple Choice

In a monohybrid testcross involving a heterozygous parent (Aa) and a homozygous recessive parent (aa), what possible genotype(s) can be observed among the offspring?

Only Aa

AA and Aa

AA and aa

Aa and aa

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Verified step by step guidance

Identify the genotypes of the parents involved in the testcross. One parent is heterozygous (Aa) and the other is homozygous recessive (aa).

Determine the possible gametes each parent can produce. The heterozygous parent (Aa) can produce gametes carrying either 'A' or 'a', while the homozygous recessive parent (aa) can only produce gametes carrying 'a'.

Set up a Punnett square to combine the gametes from each parent. Place the gametes from one parent on the top and the other parent on the side.

Fill in the Punnett square by combining the alleles from each parent to find the possible genotypes of the offspring. This will result in offspring genotypes of either 'Aa' or 'aa'.

Conclude that the possible genotypes observed among the offspring are 'Aa' and 'aa', which matches the expected outcome of a monohybrid testcross involving a heterozygous and a homozygous recessive parent.