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

Overview of interacting Genes

Genetics

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

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Multiple Choice

Which of the following best completes the statement: The expression of genes can be affected by molecular signals sent from other cells?

enzymes; genes

signals; cells

hormones; alleles

proteins; chromosomes

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Verified step by step guidance

Step 1: Understand the statement to be completed: 'The expression of genes can be affected by molecular signals sent from other ____.' This means we are looking for a word that represents the source of the signals.

Step 2: Consider the options given and identify which words logically fit the blanks. The first blank should refer to the type of molecular signals, and the second blank should refer to the origin of these signals.

Step 3: Recall that molecular signals affecting gene expression are often called 'signals' or 'hormones,' and these signals typically come from other 'cells' rather than 'genes,' 'alleles,' or 'chromosomes.'

Step 4: Evaluate each option: 'enzymes; genes' does not fit because enzymes are not typically described as signals sent from genes; 'signals; cells' fits well because signals are molecular messages sent from cells; 'hormones; alleles' is incorrect because alleles are gene variants, not signal sources; 'proteins; chromosomes' is incorrect because chromosomes are structures within cells, not signal sources.

Step 5: Conclude that the best completion is 'signals; cells' because molecular signals (like hormones or other signaling molecules) are sent from other cells to affect gene expression.