An "S" shaped curve is characteristic of logistic population growth
Indicate whether the statement is true or false.
ANSWER: True
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What do all deuterostomes have in common?
A) Adults are bilaterally symmetrical. B) Embryos have pharyngeal pouches that may or may not form gill slits. C) All have a spinal column. D) All have specialized head and tail regions. E) The pore (blastopore) formed during gastrulation becomes the anus.
Answer the following questions using the group of answers below.
A. In a dihybrid cross between a parent that is a double heterozygote (Aa Bb) and a parent that is homozygous recessive for one gene and heterozygous for the other (aa Bb), how many unique phenotypes potentially will be present in their offspring? B. In a dihybrid cross between a parent that is a double heterozygote (Aa Bb) and a parent that is a double homozygous recessive (aa bb), how many unique phenotypes potentially will be present in their offspring? C. In a dihybrid cross between a parent that is a double heterozygote (Aa Bb) and a parent that is homozygous dominant for one gene and heterozygous for the other (AA Bb), how many unique genotypes potentially will be present in their offspring? D. E. Animal species X is tetraploid (4n = 12). Following gene duplication and translocation, a given gene is found on each chromosome. How many alleles for this gene can be present in an individual of this species? F. Plant species X is diploid (2n = 24) and has a quantitative trait, the expression of which is controlled by gene loci on each of its chromosomes. What is the maximum number of alleles for this trait that any one individual of species X could have?
Suppose that the circular muscles in an earthworm have become selectively paralyzed such that they are not able to contract. How will this affect the earthworm's locomotion?
A) The earthworm will be able to elongate, but not get thicker. B) The earthworm will be able to get thicker, but not elongate. C) The earthworm will not be able to elongate or get thicker. D) The earthworm will be able to crawl as normal.
The surgeon who advocated using disinfectants on hands and in the air prior to surgery was
A. Louis Pasteur. B. Joseph Lister. C. Antonie van Leeuwenhoek. D. Robert Koch. E. Ignaz Semmelweis.