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Three different pure-breeding dragons that have golden scales were crossed with each other. The results are below: P generation F1 F2 Golden 1 x Golden 2 blue 9 blue:7 golden Golden 1 x Golden 3 blue 9 blue:7 golden Golden 2 x Golden 3 golden all golden Given this example, how many genes are involved in dragon scale color AND what are the genotypes represented in the pure breeding dragons (P generation)? 2 genes; aaBB and AAbb 1 gene; AA, Aa, and aa 3 genes; aaBBCC, AAbbCC, and AABBcc

          Three different pure-breeding dragons that have golden scales were crossed with each other. The
results are below:

P generation
F1
F2
Golden 1 x Golden 2 blue
9 blue:7 golden
Golden 1 x Golden 3 blue
9 blue:7 golden
Golden 2 x Golden 3 golden
all golden
Given this example, how many genes are involved in dragon scale color AND what are the
genotypes represented in the pure breeding dragons (P generation)?

2 genes; aaBB and AAbb
1 gene; AA, Aa, and aa
3 genes; aaBBCC, AAbbCC, and AABBcc
        
Show more…
Three different pure-breeding dragons that have golden scales were crossed with each other. The
results are below:

P generation
F1
F2
Golden 1 x Golden 2 blue
9 blue:7 golden
Golden 1 x Golden 3 blue
9 blue:7 golden
Golden 2 x Golden 3 golden
all golden
Given this example, how many genes are involved in dragon scale color AND what are the
genotypes represented in the pure breeding dragons (P generation)?

2 genes; aaBB and AAbb
1 gene; AA, Aa, and aa
3 genes; aaBBCC, AAbbCC, and AABBcc

Added by Billy S.

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Biology for AP Courses
Biology for AP Courses
Julianne Zedalis, John Eggebrecht
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Three different pure-breeding dragons that have golden scales were crossed with each other. The results are below: P generation: F1: Golden 1 x Golden 2 blue Golden 1 x Golden 3 blue Golden 2 x Golden 3 golden F2: 9 blue:7 golden 9 blue:7 golden all golden Given this example, how many genes are involved in dragon scale color AND what are the genotypes represented in the pure breeding dragons (P generation)? 2 genes; aaBB and AAbb
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Transcript

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00:01 In this question, the information given is as follows that you have a dragon with magenta scale, green fire, and you do not know it's such a genotype.
00:08 So you test crossed it with another dragon that had silver scales and red fire, and you get the following progeny where m is for magenta scales, green is for green fire, for i use capital g, s is for silver scales and r is for red fire.
00:25 The first question that is that we have to answer is basically that which of the genes are dominant and which are recessor.
00:31 Now remember the principle of the test cross is that the animal or the genotype that you test cross it with, it is always recessive.
00:41 So these are homozygous recessor.
00:45 So recessive and homozygous.
00:48 That means my magenta is dominant.
00:51 So for magenta, if i am using capital m.
00:55 For silver i will be using small m again the green fire is dominant over red fire so for green fire i will be using a capital g and for red fire subsequently we will use we can use you know r or we can also use small g but let's go with small g that's the first part b part is what was the genotype of your friends dragon so this is homozygous recesses so its genotype will be small m small m small g a small c is what are all of the possible genotype of your dragon.
01:32 Now this magenta scale with green fire can, it could be a homozygous dominant condition, capital m...
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