Example 6: Testcross = an individual of unknown genotype is...

Example 6: Testcross = an individual of unknown genotype is crossed with a homozygous recessive individual - can be used to determine the genotype of any phenotype that is dominant b b Genotypic Ratio Phenotypic Ratio Example 7: Incomplete Dominance = the F1 Generation will have a phenotype in between that of the parents Example: Red flowers (R) and White flowers (r) can make Pink flowers (Rr) Genotypic Ratio Phenotypic Ratio Example 8: Codominance = when both alleles for a gene are expressed in a heterozygous offspring Example: Red coat color (R) in horses is codominant with white coat color (R') to make a horse that shows a mix of red and white coat (RR'). Genotypic Ratio Phenotypic Ratio

Transcript

00:01 In order to ask this question, let's talk about inheritance, etc.

00:04 An individual of a known genotype is cross with a homozygous herself individual, it can be used to determine a genotype of any phenotype that is dominant.

00:13 So, let's suppose here you have the dominant allele -a, and the recessive all in order to express the dominant phenotype, you need the homo -sigo -s -degos -domin both of the genocytocytes both of the genocytes for the dominant phenotype and only the homo -sidesifice to the recitalive phenotype.

00:31 In this case, let's suppose that you have an organism with a dominant genotype.

00:36 So you don't know if the organism is homozygous dominant or heterocygous so you are going to represent that like this.

00:42 And in order to determine the genotype of this organism here, as suppose it is a plant, okay? you have to do a test cross, and the test cross we're going to cross this organism in question that is this one here with a homocyglygo recessive like this.

00:57 Okay.

00:58 So, well in this case, they are using the b gene.

01:02 So let's just change the b here.

01:07 And i almost say this is a good here.

01:11 Remember that one organism here is one allele from each parent.

01:15 So in this case, this parent only has recessive adiles to transmit to the offspring.

01:19 So one allele for the offspring is going to be always a recessive allele coming from this parent.

01:25 And this elite can be dominant allele or this allele that you don't know.

01:30 So if this organism in question is homoseoseose dominant, then all the alines here are going to be dominant, always, and you're going to have that all your off -prin are going to be dominant, okay? i'm going to have the dominant phenotype.

01:42 But if you have here the excessive allele, then in some times or sometimes this parent is going to make this dominant ally here, you're going to have the dominant phenotype for some off -creen.

01:53 But in some situations or in some cases, this recessive bee can be transmitted here, and you're going to have the homozyphoid.

02:00 So some offspring are going to have the aggressive phenotype.

02:05 So if you perform a test cross and you see that at least one offspring has the progressive phenotype, then it means that your organization question is heterocylus.

02:14 Okay, so in this case, you have here and you have a blank here because you don't know if your organism is homozygous domino on heterocygles.

02:25 Let's suppose that it is homozygous domino.

02:27 So you're going to have here, hydrocygos, heterocygose, heterocygose, heteroserogens and homozygos, glycissive...

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