Individuals that have 2 alleles for most gene loci are best described as
A. haploid.
B. diploid.
C. dihybrid.
D. homozygous.
E. heterozygous.
B. diploid.
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Four of the five time periods listed below represent
milestones in the evolution of life on Earth. Select the exception. a. 12 to 15 billion years ago b. 3.2 billion years ago c. 2.1 billion years ago d. 570 million years ago e. 200 million years ago
About how long does the average red blood cell live?
a. 4 days b. 4 weeks c. 4 months d. 1 year e. 4 years
If a tetraploid species gave rise to a new species by autopolyploidy, how many sets of homologous chromosomes would the new species have in its somatic cells?
a. Eight b. Sixteen c. Three d. Two e. Four
The amniotic egg evolved as an adaptation
A. to prevent desiccation. B. to permit the embryo to develop undisturbed up to the time of hatching. C. to insure survival in the uterus. D. against predation.