What Are Homologous Chromosomes?

What are homologous chromosomes? How can you tell if chromosomes are homologous? In this video, we'll review what homologous chromosomes actually are, tips for how you can identify them in a diagram, and we'll see how they're different from sister chromatids.

#homologous #homologouschromosomes #sisterchromatids

When multiple copies of the same type of chromosome are present in a cell, these are homologous chromosomes. These chromosomes are very similar structurally (size and centromere location), and they carry the same genes...BUT, because they're inherited from different parents, the sequences of those genes (alleles) aren't necessarily the same.

Contrast that with sister chromatids, which are part of the same replicated chromosome, and are identical. Check out my video for more about sister chromatids:    • Sister Chromatids and Chromosome Replicati...  

00:00 Intro
00:11 Haploid human karyotype (autosomes and sex chromosomes)
00:35 Diploid human karyotype with homologous chromosomes
01:16 How to identify homologous chromosomes
01:45 Why aren't homologous chromosomes identical?
02:05 How are homologous chromosomes different from sister chromatids?
02:32 Tips for finding homologous chromosomes in a diagram
03:14 PRACTICE identifying homologous pairs

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More about chromosomes!
   • What is a Monosomy or Trisomy? Aneupoidy E...  
   • Euploidy: What is Haploid, Diploid, Triplo...  
   • Sister Chromatids and Chromosome Replicati...  
   • Know these Differences: Mitosis and Meiosi...  

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