In cows black (B) is dominant to brown (b). If a brown purebred cow was mated with a black purebred cow what would the resulting offspring be in Box "2"……. {3...80%}

All black offsprings (Bb)

Explanation:

This question involves a single gene coding for skin color in cow. The allele for black color (B) is dominant over the allele for brown color (b). This means that allele 'B' will always mask the phenotypic expression of allele 'b' in a heterozygous state.

Based on the question, a brown purebred cow mates with a black purebred cow. A purebred cow means a cow that is homozygous (same allele) for a particular trait and produces only one type of gamete. Hence, a purebred brown cow will have genotype: bb while a purebred black cow will have genotype: BB.

If BB and bb are involved in a cross, each parent cow will produce gametes with genotypes B and b respectively. Using these gametes in a punnet square (see attached image), all offsprings of this cross will possess a genotype: Bb, which will be phenotypically black because the black allele (B) will exhibit its dominance.

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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.

a chair, a bed, and a toothbrush

explanation: