Supa rate mdivi epent assortrnent 5.) [8 pts] A cross between plants yie progeny

Question

Supa rate mdivi epent assortrnent 5.) [8 pts] A cross between plants yie progeny that are white. Give genetic explana symbols and give the genotypes of the parent and ot two green plants yields 2/3 progeny that are green and 13, a reasonable genetic explanation for this result. Assign 3-b white AA het Cross Aisa athal trait, its, dined vwhun haant whunitis Cross with A this is 3:1 w will y If a cross AABbDdee x 6.) 110 points] The genes A.B.D. and E assort i AaBbddee is performed, what fraction of the progeny will be Aabbddee? (Hint: Do NOT do a Punnett Sq. Show your work) The fraction the Aabbdee is a 2

Explanation / Answer

5. When two green plants are crossed, 2/3 offspring are green and 1/3 offspring are white. The ratio 2:1 occurs when two green plants which are mated shows lethality. AyA is responsible for green progeny and AA is responsible for white progeny. Here Ay is a lethal trait, it is died when it is shelf crossed Ay x Ay. When Ay is crossed with A, it hides the effect of A and produce green progeny (means it is dominant). Because of the lack of the lethal progeny gives 2:1 ratio.

AyA= 2/3= green progeny

AA=1/3= white progeny

AyA x AyA= AyAy, AyA, AyA and AA

AyAy = lethal progeny

AyA and AyA = green progeny (2/3)

AA= white progeny (1/3)

6. The cross between AaBbddee x AABbDdee

The fraction of the progeny can be calculated as follows

Aa x AA=AA, AA, Aa and Aa

Fraction of the Aa=1/2

Bb x Bb= BB, Bb, Bb and bb

Fraction of the bb=1/4

Dd x dd= Dd, Dd, dd and dd

Fraction of the dd=1/2

ee x ee= ee, ee, ee and ee

Fraction of the ee=1/1

Hence, the fraction of the progeny Aabbddee=1/2x1/4x1/2x1/1=1/16

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