Multiple Choice
Which of the following best describes developmental homologies?
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20. Development
Developmental Biology
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Cytoplasmic determinants __________.
A
act by binding to a plasma protein receptor that then initiates a signal-transduction pathway
B
are coded for by paternal genes
C
are carried to the ovum by the sperm
D
are coded for by embryonic genes
E
are coded for by maternal genes
Verified step by step guidance1
Understand the concept of cytoplasmic determinants: These are molecules found in the egg's cytoplasm that influence early development by regulating gene expression in the embryo.
Recognize that cytoplasmic determinants are not related to paternal genes or carried by sperm, as they are present in the egg before fertilization.
Identify that cytoplasmic determinants are not coded by embryonic genes, as they exist prior to the formation of the embryo.
Clarify that cytoplasmic determinants are indeed coded for by maternal genes, as they are deposited in the egg by the mother during oogenesis.
Conclude that the correct statement is that cytoplasmic determinants are coded for by maternal genes, which guide early developmental processes.
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