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notsponge [240]
1 year ago
7

In a dihybrid cross, if two heterozygotes (for both genes) are crossed, what will be the expectedphenotypic ratios? (In the foll

owing order: dominant for both traits; dominant for the first trait andrecessive for the second; recessive for the first trait and dominant for the second; recessive forboth traits.)

Biology
1 answer:
olga nikolaevna [1]1 year ago
4 0

In questions like this, the best thing to do is write an example

First of all you need to know that a heterozygous may contribute genotypically different alleles: SY Sy sY or sy

So, if you cross two heterozygotes:

<em>SY Sy sY sy</em>

<em>SY</em><em>SSYYSSYySsYYSsYy</em>

<em>Sy</em><em>SSYy</em><em /><em>SSyy</em><em /><em>SsYy</em><em /><em>Ssyy</em>

<em>sY</em><em>SsYY</em><em /><em>SsYy</em><em />ssYYssYy

<em>sy</em><em>SsYy</em><em /><em>Ssyy</em><em />ssYy<em>ssyy</em>

<em />

<em>-Well, you see that dominant for both trails are: SSYY, SSYy, SsYY or SsYy</em>

<em>If you count them there are </em><em>9 dominant for both trails</em>

<em>-Dominant for the the</em><em> first trait and recessive for the second </em><em>can be: SSyy or Ssyy</em>

<em>If you count them there are </em><em>3 of them</em>

<em>- In r</em>ecessive for the first trait and dominant for the second<em> we have two possibilites ssYY or ssYy</em>

<em>So, we see that again we have </em>3 cases

-<em> Finally, for recessive for both trails the only possibility is ssyy</em>

<em>We have just one case (the one is left in the chart)</em>

<em />

<em>You can write it like this: 9:3:3:1</em>

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<u>--------——–—---------</u>

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