The key gene in mammalian sex determination is
A) the testis-determining factor gene.
B) the Y-factor gene.
C) the holandric factor gene.
D) the X-inactivation center.
E) the lyonization gene.
A
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This chemical is produced at the terminus of the axon, is typically a protein, and diffuses across the synaptic cleft to cause the neural message to be continued in the receiving cell
a. ATP b. ACH c. ACTH d. TSH e. neurotransmitter
In incomplete dominance, the phenotype of the heterozygous genotype is an intermediate between the phenotype of either homozygous genotype
Indicate whether the statement is true or false
A change in one partner in a close relationship that leads to a change in the other partner is
A. symbiosis. B. mutualism. C. coevolution. D. synergism. E. antibiosis.
Which of the following hormones is produced in the ovaries?
a) estrogen b) vasopressin c) prolactin d) oxytocine