Assume you have mated a homozygous dominant purple, square plant with a homozygous recessive pink, spherical plant. What is the proportion of purple and spherical plants that would be produced in the F2 generation?
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
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
2. Mendel's Laws of Inheritance
Dihybrid Cross
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Two organisms with the genotypes Aa bb Cc Dd Ee and Aa Bb Cc dd Ee were crossed. Use the branch method to determine the proportion of the following genotypes in the offspring. III. AA BB CC Dd ee
A
1/256
B
1/64
C
1/16
D
0

1
Step 1: Identify the genotypes of each parent for each gene. Parent 1 has Aa bb Cc Dd Ee, and Parent 2 has Aa Bb Cc dd Ee.
Step 2: Determine the possible allele combinations for each gene separately using the branch method. For example, for gene A, the possible combinations are AA, Aa, and aa.
Step 3: Calculate the probability of each desired genotype combination occurring in the offspring. For AA, both parents must contribute an A allele, which has a probability of 1/4.
Step 4: Repeat the process for each gene in the desired genotype (BB, CC, Dd, ee), calculating the probability of each combination.
Step 5: Multiply the probabilities of each gene combination to find the overall probability of the offspring having the genotype AA BB CC Dd ee.
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