Each phase of succession is called a
A. series.
B. stage.
C. chronometer.
D. sere.
E. facilitation.
D. sere.
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The production of gene families, such as the globin genes is the result of ________
A. inversions B. deficiencies C. gene duplications D. simple translocations E. None of the answers are correct
What were the genotypes / phenotypes in the Parental generation?
An experimenter crosses two fruit flies with different phenotypes. The results in the F2 generation are: 478 crooked legs, trembling behavior 372 stumpy legs, circling behavior 175 crooked legs, circling behavior 98 stumpy legs, trembling behavior A. Both parents homozygous / Female phenotype: crooked legs, trembling, Male phenotype: stumpy legs, circling B. Both parents homozygous / Male phenotype: crooked legs trembling, Female phenotype: stumpy legs, circling C. Both parents heterozygous / Female phenotype: crooked legs, trembling, Male phenotype: crooked legs, trembling D. Both parents homozygous / Male or female parental phenotype: crooked legs, trembling, Second parental phenotype: stumpy legs, circling E. Both parents heterozygous / Both parental phenotypes: crooked legs, trembling
Which of the following is the best answer for why plants require nitrogen?
A. to make carbon nitrogen bonds B. to make chlorophyll C. to make amino acids and nucleotides D. to make cell walls E. to make membranes
At the end of metaphase I, separate
a. homologous chromosomes b. haploid chromatids c. sister chromatids d. centrioles e. germ cells