Because group selection _________________, it very rarely occurs.
a) is beneficial for the species
b) is detrimental to the population
c) decreases the reproductive success of individuals
d) has no effect on allele frequencies
e) increases the reproductive success of individuals
Ans: c) decreases the reproductive success of individuals
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Which of the following occurs during mitosis but not during meiosis 1?
A. The chromosomes are pulled to opposite poles of the spindle apparatus B. The chromatids of each chromosome are separated C. The nuclear envelope breaks down D. Both synapsis and crossing over take place E. The diploid number of chromosomes is reduced to the haploid number
The sequence of amino acids in a protein is based on the ________ of the mRNA.
Fill in the blank(s) with the appropriate word(s).
Each layer in a soil profile is called _______________.
A. dirt B. humus C. topsoil D. a horizon E. a bed
The seed coat is formed by the hardening of the
A. prothallus. B. embryo. C. ovule. D. endosperm. E. integument.