A male sea lion is very large in comparison to its female counterparts and has a large sagittal crest on its head. What is this an example of?
a. Sexual dimorphism
b. Type specimen
c. Sexual variety
d. Isolating mechanism
a
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Normally, gestation lasts for approximately ____ weeks in humans
a. 28 b. 38 c. 44 d. 50 e. 60
Synonymous changes that arise within coding sequences of genes
A) generally have no effect on the phenotype. B) are usually detrimental to fitness. C) may be eliminated by natural selection. D) occur more frequently than nonsynonymous changes. E) B and C only
Which of the following statements regarding genotypes and phenotypes is false?
A) The genetic makeup of an organism constitutes its genotype. B) An organism with two different alleles for a single trait is said to be homozygous for that trait. C) Alleles are alternate forms of a gene. D) The expressed physical traits of an organism are called its phenotype.
Lazzaro Spallanzani was the first scientist to provide evidence disproving the spontaneous generation of microorganisms
Indicate whether the statement is true or false