Two plants, one 50% purple and one 50% purple, were crossed to produce the F1 generation, which

Step 1: The F1 generation is 100% purple, which means that both parents must have contributed a

Two plants, one 50% purple and one 50% purple, were crossed...

Transcript

00:01 When we look at classic dominance inherent, so classic dominance and recessiveness, there's a few different ways that it can go, but it's always predictable.

00:12 So i'll show you a few examples.

00:14 So this first example is what happens when both parents have homozygous genotypes that match.

00:25 So they are both fully dominant or they're both homozygous recessive.

00:32 So what happens, and i'll do a little punnet square to show you, say if they're both homozygous recessive, then one parent gives two recessive alleles.

00:42 So the parent gives two recessive alleles.

00:45 And if you do that whole punnet square, you see that 100 % of the offspring have the same genotype as the parents.

01:02 If both parents are totally recessive, then all the children will be totally recessive.

01:07 If both parents are totally dominant, then all the children will be totally dominant.

01:15 They can only give their offspring, whatever they have.

01:21 So another option is, okay, well, what if one parent is totally dominant, but the other is totally recessive? well, then you would see that all the offspring will be the same.

01:35 But they will all be heterozygous.

01:39 So 100 % will be heterozygous having one dominant allele from the first parent, one recessive from the other parent.

01:52 But that means they will all have the dominant phenotype.

01:59 But again, this is 100 % of the offspring.

02:02 It's easy to predict that all of them will have the exact same genotype, the exact same phenotype.

02:10 Now, the other options we have are when there's multiple options that we'll, one or both parents could give, so you end up with different ratios.

02:21 So for example, if both parents are heterozygous, so if some of these children came up, decided to have children with someone who was also heterozygous, you would end up with an entirely different scenario.

02:38 So see, this parent could give a dominant and a recessive allele.

02:43 The next parent could also give a dominant and a recessive allele.

02:47 So, we would.

02:47 When you do that punnet square, you see there's lots of options.

02:52 You know, there's a one in four chance or 25 % chance that the offspring will be homozygous dominant.

03:01 And there's a one, two in four chance that the offspring will be heterozygous.

03:08 And there is a one in four chance that the offspring will be homozygous recessive.

03:16 So in this case, there's a lot more...

Question

Two plants, one 50% purple and one 50% purple, were crossed to produce the F1 generation, which were all 50% purple. What are the genotypes of the P generation?

Question

Two plants, one 50% purple and one 50% purple, were crossed to produce the F1 generation, which were all 50% purple. What are the genotypes of the P generation?

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