If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is
(a) diploid.
(b) unable to undergo meiosis.
(c) haploid.
(d) none of the above.
(a) diploid.
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In a newly fertilized egg, the vitelline layer _____
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter B) lifts away from the egg and hardens to form a fertilization envelope C) secretes hormones that enhance steroidogenesis by the ovary D) reduces the loss of water from the egg and prevents desiccation E) provides most of the nutrients used by the zygote
Imagine that sexual reproduction could occur between hyphae that were the same mating type. How might this affect rates of evolution in fungi?
A. Rates of evolution would be lower because genetic variation would be lower. B. Rates of evolution would be higher because more novel genetic combinations are generated through sexual reproduction. C. Rates of evolution would stay the same because as long as sexual reproduction is occurring, it does not matter if it is between individuals of the same or different mating type.
The organizational phases of development are regulated by
A. transcription factors B. morphogens C. segmentation genes D. morphogens and transcription factors only E. morphogens, transcription factors, and segmentation genes
The most abundant phagocytes in our immune
system arsenal are the
a. macrophages. b. neutrophils. c. monocytes. d. dendritic cells. e. T lymphocytes