T. H. Morgan and his colleagues found that among the offspring of genetic crosses, parental phenotypic classes were the most frequent, while recombinant classes occurred less frequently. This observation led Morgan to conclude that

A) all genes are linked.
B) alleles of linked genes assort independently.
C) alleles of some genes assort together.
D) genes on different chromosomes assort independently.
E) genes on different chromosomes do not assort independently.


C

Biology & Microbiology

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When an action potential begins

a. sodium is blocked from leaving the neuron cytoplasm. b. sodium is blocked from entering the neuron cytoplasm. c. sodium diffuses from the interstitial fluid into the neuron cytoplasm. d. sodium diffuses from the neuron cytoplasm into the interstitial fluid. e. sodium is actively pumped from the interstitial fluid into the neuron cytoplasm

Biology & Microbiology

Osteoporosis sometimes results from

a. excessive PTH secretion. b. insufficient PTH secretion. c. excessive intake of vitamin D. d. excessive intake of iodine. e. insufficient intake of vitamin D.

Biology & Microbiology

The brain stores large amounts of information for hours, days, or years. This type of memory is called ________

Fill in the blank(s) with correct word

Biology & Microbiology

Centrosomes are associated with

A. mitochondria. B. chromosomes. C. lysosomes. D. microtubules. E. ribosomes.

Biology & Microbiology