In tigers, a recessive allele causes a white tiger (absence of fur pigmentation). If one phenotypically normal tiger that is heterozygous is mated to another that is phenotypically white, what percentage of their offspring is expected to be white?

50% of the progeny are white animals, with pp genotype.

Explanation:

Available data:

What percentage of their offspring is expected to be white?

Parental)   Pp     x     pp

Gametes) P   p       p   p

Punnet square)     P          p

                     p     Pp        pp

                     p     Pp        pp

F1) 50% of the progeny are pigmented animals, with Pp genotype.

     50% of the progeny are white animals, with pp genotype.

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

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