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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

2. Mendel's Laws of Inheritance

Dihybrid Cross

Genetics

2. Mendel's Laws of Inheritance

Dihybrid Cross

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Multiple Choice

In a dihybrid cross in corn where both parents have the genotype ppss, what is the expected phenotypic ratio among the offspring?

All offspring will display the same phenotype

9:3:3:1

3:1

1:2:1

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Verified step by step guidance

Identify the genotypes of the parents: both are ppss, meaning they are homozygous recessive for both genes.

Determine the possible gametes each parent can produce. Since both parents are homozygous recessive (ppss), each can only produce one type of gamete: ps.

Set up the Punnett square using the gametes from each parent. Since each parent produces only ps gametes, the offspring genotype will be uniform (ppss).

Analyze the phenotype of the offspring based on the genotype ppss. Because all offspring have the same genotype, they will all display the same phenotype.

Conclude that the expected phenotypic ratio among the offspring is 100% the same phenotype, not the typical 9:3:3:1 or other ratios seen in heterozygous dihybrid crosses.