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ch 28, 29
Terms in this set (14)
At what point is meiosis II completed for the female gamete?
In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.
An individual who is heterozygous for a particular trait, yet expresses both alleles of that trait, is demonstrating an example of ________.
Derivatives of the mesoderm include ________.
vertebrae and ribs
The term lethal dominant gene indicates that the gene causes death only when the individual is homozygous dominant.
Genetic segregation implies that the members of the allele pair determining each trait are distributed to different gametes during mitosis.
In incomplete dominance, the heterozygote has an intermediate phenotype between that of homozygous dominant and homozygous recessive individuals.
Milk ejection (the letdown reflex) is stimulated by which of the following hormones associated with pregnancy?
Acrosomal enzymes trigger exocytosis of cortical granules in the cortical reaction.
The cardiovascular system of a newborn must be adjusted after the infant takes its first breath. Which of the following is also true?
The ductus arteriosus constricts and is converted to the ligamentum arteriosum.
A urine test reveals a positive result for human chorionic gonadotropin (hCG). This indicates ________ was successful.
Y chromosomes contain far more genes than X chromosomes.
A zygote is usually formed within the uterus.
Genetic variation results from the crossing over and exchange of chromosomal parts that occur during meiosis II.
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