Partial or complete loss of hearing (deafness) can be caused by damage to the ________.

I) axons of the neurons associated with each hair cell that carry information to the brain

II) hair cells (the sensory receptors) in the cochlea

III) tympanic membrane, or eardrum

TLS Online TPP Program

#Question id: 15152

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.

Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in series with dominant mutations in both genes, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.

TLS Online TPP Program

#Question id: 12335

#Unit 10. Ecological Principles

How does the foraging of animals on tree seeds affect the distribution and abundance of the trees? This question

TLS Online TPP Program

#Question id: 13220

#Unit 6. System Physiology – Plant

The symplast consists of the entire network of cell cytoplasm interconnected by

TLS Online TPP Program

#Question id: 1089

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements describes a likely effect of a drug designed that inhibits the cellular response to testosterone?

TLS Online TPP Program

#Question id: 11048

#Unit 6. System Physiology – Plant

In vascular plants, phloem is the living tissue that transports the soluble organic compound made during photosynthesis in the form of sugar, The phloem tissue is made up of cells called phloem elements. Which of the following given phloem elements are directly involved in translocation?