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#Question id: 7092


A gap gene mutation might cause which of the following defects in the embryonic body plan?

#Unit 5. Developmental Biology
  1. every other segment would be missing, resulting in T1, T3, A2, A4, etc. but no T2, A1, A3, and so on.
  2. segments A2 through A6 would be missing, but the rest of the pattern is essentially normal
  3. patterning within each segment would be abnormal, causing for example denticle belts to form across the entire segment
  4. the identity of one or more segments would be transformed to that of a different segment, such that the T3 leg would transformed to a T2 leg
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#Question id: 5751

#Unit 8. Inheritance Biology

A biochemical mutant that must be supplied with a particular nutrient for growth would be described as a(n)

TLS Online TPP Program

#Question id: 5752

#Unit 8. Inheritance Biology

base change that changes a codon for an amino acid to a stop codon

TLS Online TPP Program

#Question id: 5753

#Unit 8. Inheritance Biology

A bacterial histidine mutant was plated on minimal medium and a single colony grew. You decide to sequence the histidine biosynthetic gene of the revertant and discover that the original mutation is still present.  This colony must have been able grow due to a

TLS Online TPP Program

#Question id: 5754

#Unit 8. Inheritance Biology

A cell is exposed to EMS (a mutagen that causes guanine to mispair with thymine) and allowed to undergo a few rounds of DNA replication.  The mutational event caused by this mutagen will be

TLS Online TPP Program

#Question id: 5755

#Unit 8. Inheritance Biology

A researcher studying bacterial toxin predicts that a lysine within the toxin is important for binding it’s target cell.  She used site-directed mutagenesis to change a codon for lysine (AAA) to one for asparagine (AAU).  However, the mutant toxin still binds to its target cell just as well as the wild-type toxin bound and appears to have no other changes. This type of mutation is probably

TLS Online TPP Program

#Question id: 5756

#Unit 8. Inheritance Biology

Type of mutation caused by an addition or deletion of a base in a polypeptide-encoding part of a gene