AP Biology Quiz 6.5 | Questions, Answers & Study Guide 2026/2027

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Quiz 3 Unit 6 (6.5 Gene Expression & 6.6 Cell Specialization)


1. Inanimals, the sox genes encode a family of transcription factors that are important for proper development of
embryonic segments and are widely conserved in organisms. The figure below shows the embryonic segments in
which one such gene, Hoxcé, is expressed in the embryo of a mouse, a chick, and a goose. Embryonic segments are
counted from the anterior end.

During the formation of vertebrae, the most anterior embryonic segment that expresses Hoxc6 marks the end of the
cervical (neck) vertebrae and the beginning of the thoracic (rib) vertebrae. All mammals have seven cervical
vertebrae.

Mous |
e [] No Hoxc6 expressed
Anerior (JOO00000DDEEDEDEEEEEE Posterior [E Hoxc6 expressed
Chick

anerior (00000000000
DD EEDEE
00Foserior
Goose

anesor (0000000000000000EDEEEDEE oo
Which of the following statements is most likely to be true?
(A) The chick and the goose have the same number of thoracic vertebrae.
@ The most anterior expression of Hoxc6 is the eighth vertebra in mammals.
(C) Hoxc6 is expressed in the same embryonic segments in birds and mammals.
(D) Hoxc6 is expressed in the same vertebra at the anterior end of all bird embryos.




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Quiz 3 Unit 6 (6.5 Gene Expression & 6.6 Cell Specialization)

: .
illustrates the P product o
how the
2. Phenotype is determined, in part, by which genes are expressed. The diagram below
gene X regulates the expression of other genes.

Gene X




Geile 1 Geile 11 Gene III Ger‘ze v


S~ ~~P
57 3 5 3! 5" 35

Which of the following statements best explains how protein X regulates gene expression?
(A) Protein X is responsible for processing pre-mRNA.
Protein X is responsible for activating transcription of some genes but not others.
(C) Protein X is a member of some cytoplasmic protein complexes but not others.
(D) Protein X causes specific base-pair changes to produce new alleles.




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