Which of the following is most likely to favor the evolution of highly virulent parasites?
A. Transmission between unrelated members of the population
B. Transmission from parent to offspring
C. Multilevel selection (both within and among populations, occupying different hosts)
D. Strong effects on a subset of a population with a specific susceptible genotype
E. Mutualism between hosts and parasites
Answer: A. Transmission between unrelated members of the population
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Answer the following statements true (T) or false (F)
1. A recessive allele is one that is masked if a dominant allele is also present. 2. The most common allele for any trait is always the dominant allele. 3. Genotypes are the outward expression of an allele combination. 4. Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes. 5. Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.
The law of independent assortment would predict that the F2 progeny of F1 heterozygous plants will exhibit a __________
A) 3:1 phenotypic ratio B) 9:3:3:1 phenotypic ratio C) 1:2:1 genotypic ratio D) 9:3:3:1 phenotypic ratio and 1:2:1 genotypic ratio E) 3:1 phenotypic ratio and 1:2:1 genotypic ratio
For gas exchange to occur quickly and efficiently, which type of epithelium must be present on all respiratory surfaces?
a. pseudostratified columnar epithelium b. simple squamous epithelium c. ciliated columnar epithelium d. stratified squamous epithelium e. ciliated squamous epithelium
In the Arabidopsis cdka;1 mutant the central cell of the female gametophyte is not fertilized. What structure will not form in these mutant plants?
A. endosperm B. pollen tube C. synergids D. egg cell