Which of the following functions is an advantage of a fluid-filled body cavity?

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#Question id: 10987

#Unit 7. System Physiology – Animal

If the ventricular Purkinje fibers become the pacemaker of the heart, what is the expected heart rate?

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#Question id: 8907

#Unit 9. Diversity of Life Forms

The endoskeletons of most vertebrates are composed of calcified

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#Question id: 19222

#Unit 12. Applied Biology

Selectable marker, which will eventually be used to detect the presence of the T-DNA inserted into the plant chromosomal DNA, is usually placed next to the

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#Question id: 3536

#Unit 8. Inheritance Biology

What is the probability that selfing an F1 plant from Mendel dihybrid cross ( RrYy X RrYy) will produce an offspring with an rrYY genotype?

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#Question id: 15150

#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 recessive mutations in both genes, the F1 progeny shows will have red eye, what is the expected phenotypic ratio of red to white eyed insects in the F2.