The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull. Black (B) is the complete dominant characteristic. 4.1.1 Identify the genotype of the: (a) Parent black cow (b) Parent white bull 4.1.2 If the group of white heifers in the F1 generation is crossed with the parent bull, determine the phenotype of the F2 offspring. 4.1.3 Use the Punnett square method to illustrate the genotype of the F1 generation.

NSC Agricultural Sciences Production Factors: The schematic representation bel

The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull - NSC Agricultural Sciences - Question 4 - 2016 - Paper 2

Question 4

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The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull. Black (B) is the complete dominant chara... show full transcript

Worked Solution & Example Answer:The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull - NSC Agricultural Sciences - Question 4 - 2016 - Paper 2

Step 1

Identify the genotype of the: Parent black cow

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Answer

The parent black cow is heterozygous for the black phenotype. Therefore, the genotype is Bb (where B represents the dominant black gene and b represents the recessive white gene).

Step 2

Identify the genotype of the: Parent white bull

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Answer

The parent white bull is homozygous recessive, and its genotype is bb because it only carries the recessive white alleles.

Step 3

Determine the phenotype of the F2 offspring.

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When the F1 generation (which consists of both Bb and bb individuals) is crossed with the parent bull (Bb), the F2 generation will exhibit the phenotype of 50% black (from Bb) and 50% white (from bb).

Step 4

Use the Punnett square method to illustrate the genotype of the F1 generation.

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To determine the genotype, we can set up a Punnett square:

      B   |   b
    ---------------
 b |   Bb  |  bb  
    ---------------
 b |   Bb  |  bb

From this Punnett square, we can see that the genotypes of the F1 generation are 50% Bb and 50% bb.

The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull - NSC Agricultural Sciences - Question 4 - 2016 - Paper 2

Worked Solution & Example Answer:The schematic representation below indicates a cross between a heterozygous black cow and a homozygous recessive white bull - NSC Agricultural Sciences - Question 4 - 2016 - Paper 2

Identify the genotype of the: Parent black cow

Identify the genotype of the: Parent white bull

Determine the phenotype of the F2 offspring.

Use the Punnett square method to illustrate the genotype of the F1 generation.

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