LS4 MT2 practice key

LS4 MT2 practice key - Name_ LS 4 INTRODUCTORY GENETICS...

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Name_________________________ LS 4 INTRODUCTORY GENETICS MIDTERM II practice problems
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Name_________________________ 1 The following cross is done in the Pea plant. P AAbb x AAbb F1 AaBb These F1 progeny are then testcrossed as follows: AaBb x aabb The A and B alleles are dominant and the a and b alleles are recessive. If the A locus and B locus are on different chromosomes, what ratio of phenotypes would you expect among the progeny. phenotypes AB : Ab : aB : ab fill in expected ratios 1 : 1 : 1 : 1 . If the A locus and B locus are on the same chromosome and linked so tightly that no recombination is detected between them, what ratio of phenotypes would you expect among the progeny. phenotypes AB : Ab : aB : ab ratios 0 : 1 : 1 : 0 . If the A locus and B locus are on the same chromosome and separated by 20 map units, what ratio of phenotypes would you expect among the progeny. phenotypes AB : Ab : aB : ab ratios 1 : 4 : 4 : 1 .
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Name_________________________ 2 You are studying the inheritance of two genes (A and B) in the pea plant. These genes have an identical function, giving the plant a purple flower. Only a plant that is homozygous recessive for both genes (aabb) has a white flower, any other combination of alleles (A_B_, A_bb or aaB_) gives a purple flowered plant. Genes A and B are linked and are 10 map units apart. For the following crosses, determine what % of the F2 progeny will have white flowers. (SHOW YOUR WORK) AABB X aabb F1 ( self ) F2 The correct answer is .45 x .45 = 20.25%
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Name_________________________ 3. A cross is made between Hfr arg
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LS4 MT2 practice key - Name_ LS 4 INTRODUCTORY GENETICS...

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