Genetic Markers and Their Applications

The video tutorial introduces genetic markers, which are DNA sequences used to identify individuals or species. It explains the two types of genetic markers: codominant and dominant. Codominant markers allow for the differentiation of homozygous and heterozygous genotypes by showing bands for both alleles in PCR. Dominant markers, however, only show the dominant allele, making it difficult to distinguish between homozygous and heterozygous genotypes. The video provides examples of PCR using both types of markers and concludes by highlighting the advantages of codominant markers in genotyping applications.

What is the primary purpose of a genetic marker?

• To create new species

• To identify individuals or species

• To alter DNA sequences

• To eliminate mutations

Which of the following is NOT a type of genetic marker?

• Mutant

• Codominant

• Recessive

• Dominant

In the plant example, what are the two alleles used?

• Capital D and small d

• Capital A and small a

• Capital C and small c

• Capital B and small b

What is the genotype of a heterozygous plant in the example?

• Capital B Small b

• Capital A Small a

• Small a Small a

• Capital A Capital A

What is the advantage of using codominant markers in PCR?

• They require less DNA

• They are faster

• They can distinguish between homozygous and heterozygous plants

• They are cheaper

Which type of marker allows you to see bands for both alleles in a heterozygous plant?

• Mutant

• Dominant

• Recessive

• Codominant

What does SSR stand for in the context of genetic markers?

• Simple Sequence Repeat

• Single Sequence Repeat

• Simple Sequence Recessive

• Single Sequence Recessive

What is a limitation of using dominant markers in PCR?

• They are not reliable

• They require special equipment

• They cannot distinguish between homozygous and heterozygous plants

• They are too expensive

In the context of dominant markers, what is typically observed in a gel for a heterozygous plant?

• Only the recessive allele band

• Two bands

• Only the dominant allele band

• No bands

Why are codominant markers preferred for most applications?

• They are easier to use

• They are less expensive

• They provide more detailed genetic information

• They are more colorful