The period gene of Drosophila melanogaster encodes for a stretch of Thr-Gly repeated in tandem. In natural populations, the three most common alleles encode for 17, 20 and 23 Thr-Gly repeats.  The amplification by PCR of the allele encoding for 20 Thr-Gly repeats produces a fragment of 320 bp. Using the same set of primers, what is the size expected when amplifying the 17 Thr-Gly allele?     317     303     314     302   In a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive.  Knowing that a plant with genotype AAbbCc has a pink flower, which genotype, among the ones listed below, will produce the same phenotype?      Aabbcc.     aabbcc.     AaBbCc.     AABBCc.     In pea plants, tall (T) is dominant to dwarf (t) and yellow (Y) is dominant to green (y).  In a cross of true-breeding tall yellow peas x dwarf green peas, what proportion of the progeny are tall with yellow peas?     100%     50%     25%     75%

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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The period gene of Drosophila melanogaster encodes for a stretch of Thr-Gly repeated in tandem. In natural populations, the three most common alleles encode for 17, 20 and 23 Thr-Gly repeats.  The amplification by PCR of the allele encoding for 20 Thr-Gly repeats produces a fragment of 320 bp. Using the same set of primers, what is the size expected when amplifying the 17 Thr-Gly allele?

   

317

   

303

   

314

   

302

 

In a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive.  Knowing that a plant with genotype AAbbCc has a pink flower, which genotype, among the ones listed below, will produce the same phenotype

   

Aabbcc.

   

aabbcc.

   

AaBbCc.

   

AABBCc.

 

 

In pea plants, tall (T) is dominant to dwarf (t) and yellow (Y) is dominant to green (y).  In a cross of true-breeding tall yellow peas x dwarf green peas, what proportion of the progeny are tall with yellow peas?

   

100%

   

50%

   

25%

   

75%

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