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 breeding in the future. White sheep in the flock continued to reproduce in that year and the years that followed. As a result of the farmer's action it is reasonable to predict that A. no black lambs were born in 2006 and beyond. B. black lambs were born in 2006 but none in the following years. C. the proportion of black lambs born in 2006 was the same as in previous years. D. the proportion of black lambs born would decline gradually in the years following 2005.

SSCE VCE Biology Mechanisms of Inheritance: In sheep, white wool (B) is domi

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 statement is not accurate. The existence of black sheep originally in the flock means that while their numbers would reduce, it's possible for black lambs to be born from the remaining genetic contributions.

Step 2

B. black lambs were born in 2006 but none in the following years.

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Answer

This statement is incorrect because, given enough recessive genes in the flock (from previous breedings), there could still be occurrences of black lambs in future generations.

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 also inaccurate, as the farmer's decision to cease breeding any black sheep impacts the genetic likelihood of producing black lambs, thus changing their proportion.

Step 4

D. the proportion of black lambs born would decline gradually in the years following 2005.

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Answer

This statement is the most reasonable prediction. Without any further breeding of black sheep, the likelihood of producing black lambs diminishes over time, leading to a gradation in their proportion in subsequent years.

In sheep, white wool (B) is dominant to black wool (b) - VCE - SSCE Biology - Question 4 - 2008 - Paper 1

Worked Solution & Example Answer:In sheep, white wool (B) is dominant to black wool (b) - VCE - SSCE Biology - Question 4 - 2008 - Paper 1

A. no black lambs were born in 2006 and beyond.

B. black lambs were born in 2006 but none in the following years.

C. the proportion of black lambs born in 2006 was the same as in previous years.

D. the proportion of black lambs born would decline gradually in the years following 2005.

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