Genotypic adaptive landscapes better represent true adaptive landscapes than pheno-typic adaptive landscapes because:
a. single mutations can have a large effect on the phenotype.
b. phenotypic landscapes are hard to mathematically model.
c. phenotypic landscapes do not account for drift.
d. genotypic landscapes are easier to visualize.
e. genotypic landscapes are smooth.
A
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In genetic analyses, researchers know that
linkage of genes will introduce exceptions to the principle of
a. dominance. b. segregation. c. recessiveness. d. independent assortment. e. chromosome inheritance
The thin outer layer (1 to 2 mm thick) of each hemisphere of the brain that serves to increase the surface area by being arranged in a folded manner is called the ________
Fill in the blank(s) with correct word
What type of plants flower only if day length is less than a critical value?
A) short-day plants B) long-day plants C) biennial plants D) perennial plants
In Drosophila, the allele red eyes (bw+) is dominant to the allele for brown eyes (bw). At another gene locus on the same chromosome, the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv). Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F1 progeny.Given that these two gene loci are very closely linked, the genotypic ratio in the F2 generation should be closest to
A. 3:1 B. 1:2:1 C. 9:3:3:1 D. 1:1:1:1