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11111nata11111 [884]
3 years ago
13

From what you should now know about bacterial taxis and nodule formation, predict how a rhizobium would respond to a flavonoid.

Biology
2 answers:
andreev551 [17]3 years ago
6 0

Answer;

-The bacterium would exhibit positive chemotaxis.

Explanation;

-Chemotaxis is the movement of cells or organisms in response to chemicals, whereby the cells are attracted (positive chemotaxis) or repelled (negative chemotaxis) by substances exhibiting chemical properties.

Flavonoids play a crucial role as signal molecules in promoting the formation of nodules by symbiotic bacteria commonly known as rhizobia. The roots of leguminous plants use positive chemotaxis to attract rhizobia. Flavonoids are the chemicals associated with attraction of Rhizobium bacteria.

Nina [5.8K]3 years ago
3 0

The bacterium would possess positive chemotaxis.  

Chemotaxis refers to the movement of a species in reaction to a chemical stimulus. Bacteria, somatic cells, and other single-cell or multicellular species mediate their movements on the basis of some kind of chemicals in their surroundings.  

Positive chemotaxis takes place if the movement is towards a greater concentration of the chemical in question.  


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In Oompa Loompas, gray face (G) is dominant to orange recessive face (g). If two gray faced Oompas have an offspring with an ora
Neko [114]

Answer:

The genotype for each of the parents must be

parent 1 : Gg

parent 2 : Gg

Explanation:

Please note that a dominant trait is a trait that is expressed phenotypically in a heterozygous state, while a recessive trait is a trait that can only be expressed in a homozygous state.

Now, since gray face (G) for Oompa Loompas is dominant, and orange face (g) is recessive, for an offspring to be orange faced, it means that the genotype of the offspring must be 'gg'. Also, since both parent contribute an allele in the pair of alleles in the offspring, both parents must have the recessive (g) in their genotype. Moreover, we are told that both parents are gray-faced, meaning that their genotypes were 'Gg' and 'Gg'. To confirm, let me do the cross

                                 G           g

G                                GG       Gg

g                                 Gg        gg

from the cross above, we find out that out of 4 offspring, 3 were gray face (GG, Gg ) while one was orange face (gg).

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3 years ago
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