Answer:
50%
Explanation:
If black is dominant to white color and crossing with parents produced some progeny which were black and a white progeny then it simply indicates that parents were heterozygous for the trait even if phenotypically they appeared black. A cross between parents is shown as under:
Parents
Bb x Bb
Progeny: BB Bb Bb bb
BB and Bb allelic combinations produced a black mice while bb combinations produced white mice.
Now the subsequent cross between one of the parents and white off spring is shown as under:
Bb x bb
Progeny: Bb Bb bb bb
It is clear from the cross above that the progeny with Bb allelic combinations will be black while with bb combinations they will be white. 2 out of the 4 progeny are genotypically bb that means they are white i.e. 50% progeny are white.
A) is your best answer.
Relative Dating gives the 'relative dating', which allows one to find the difference of age between many different of fossils. However, radioactive dating is used to get a more exact measurement of a fossil, but it can only be used for certain types of fossils.
hope this helps
Answer:
A. an increase in sea urchin biomass is associated with more intense grazing.
Answer choices are:
A. Pollution
B. Dams
C. Flooding
D. All of the above
________________________________________________________
Correct answer choice is :
D) All of the above
________________________________________________________
Explanation:
Sulfur dioxide and nitrogenous oxide released from industries and power plants infiltrate river ways by acidic rainfall. Sewerage and effluent are released into rivers in some regions. Pollution can decrease the pH of the water, attacking all organisms from algae to vertebrates. Biodiversity reduces with reducing pH.
The answer would be C.
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