Crossing over between the A and B genes in a parental cell containing an AB chromosome and an ab chromosome yields which of the following ratios of parental:recombinant gametes?
A) 100:0
B) 75:25
C) 50:50
D) 25:75
E) The ratio depends on whether the parental cell is male or female.
Answer: C
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a. the abundance of species. b. the biomass of organisms. c. the abundance and biomass of organisms. d. the number of species. e. the number of individuals of a species.
Which of the following plants represent the
oldest living plant lineage?
a. hornworts b. liverworts c. mosses d. ferns e. conifers
Amniocentesis is
a. a surgical means of repairing deformities. b. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products. c. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos. d. a form of gene replacement therapy. e. all of these.
Which is not an example of epigenetic inheritance?
A. the inheritance of a single point mutation in a gene B. the inheritance of a regulatory protein that activates its own transcription C. the inheritance of methylation patterns in DNA D. the inheritance of patterns of chromosome condensation