In sheep, white wool (B) is dominant to black wool (b) - VCE - SSCE Biology - Question 4 - 2008 - Paper 1
Question 4
In sheep, white wool (B) is dominant to black wool (b). In 2005, a farmer with a flock of sheep containing a few black sheep decided to prevent all black sheep from ... show full transcript
Worked Solution & Example Answer:In sheep, white wool (B) is dominant to black wool (b) - VCE - SSCE Biology - Question 4 - 2008 - Paper 1
Step 1
A. no black lambs were born in 2006 and beyond.
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Answer
This option is incorrect because the absence of black sheep breeding does not guarantee that no black lambs will be born; it only affects future generations.
Step 2
B. black lambs were born in 2006 but none in the following years.
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Answer
This option is not a reasonable prediction. The existing black sheep can still reproduce in 2006 before being completely phased out.
Step 3
C. the proportion of black lambs born in 2006 was the same as in previous years.
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Answer
This option is incorrect as well, because the farmer's action of preventing breeding of black sheep would alter the proportions.
Step 4
D. the proportion of black lambs born would decline gradually in the years following 2005.
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Answer
This option is correct. Since the farmer has stopped breeding black sheep, the proportion of black lambs born should decline over subsequent years as any remaining black sheep are phased out.
