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: 28894

#Unit 4. Cell Communication and Cell Signaling

What will cause in nucleus in the absence of Wnt?

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#Question id: 3479

#Unit 11. Evolution and Behavior

Which of the following could be classified as habituation?

A) You enter a room and hear a fan motor. After a period of time, you are no longer aware of the motorʹs noise.

B) You hear a horn while driving your car. You step on the brakes but notice the sound came from a side street. You resume your previous speed.

C) One morning you awake to a beep-beep-beep from a garbage truck working on a new early morning schedule. The next week the garbage truck arrives at the same time and makes the same noise, but does not wake you up.

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#Question id: 985

#Unit 1. Molecules and their Interaction Relevant to Biology

 In the pyrimidine ring system, what is the source of the carbons 4,5 and 6 during the de novo biosynthesis of pyrimidines?

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#Question id: 15149

#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, what will be the phenotype in F1 progeny?

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#Question id: 14694

#Unit 13. Methods in Biology

Two balls are to be drawn from a bag containing 5 red and 7 white balls. Find the chance that they will both be white