'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis. Die kruising van die F1- en F2-generasies word hieronder getoon. P1 Gamete: F1-generasie: Fenotipe: 100% geel blomme Genotipe: ... F2 Fenotipe: (b) ... blomme en geel blomme Genotipe: (c) ... F2-generasie: Fenotipe verhouding: (d) ... Genotipe verhouding: (e) ... 4.2 Die tabel hieronder toon inligting van twee verskillende kruisinge in die F1-generasie.

NSC Agricultural Sciences Basic Agricultural Genetics: 'n Plant met geel blomme (Y) wor

'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis - NSC Agricultural Sciences - Question 4 - 2017 - Paper 2

Question 4

'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis. Die kruising van die F1- en F2-generasies word hieronder getoon. P1 Gamete: F1-generasie... show full transcript

Worked Solution & Example Answer:'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis - NSC Agricultural Sciences - Question 4 - 2017 - Paper 2

Step 1

Identify the marked parts (a) - (e)

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Answer

(a) $Yy$
(b) Geel
(c) $Yy$
(d) 3:1 (Geel tot Wit)
(e) 1:2:1

Step 2

State the type of dominance

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Answer

Volledige dominansie

Step 3

Give a reason for your answer to QUESTION 4.1.2

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Answer

Geel (Y) is dominant oor wit (y). Daar is geen intermediëre/nuwkleur in die nageslag nie.

Step 4

Predict the genotype of the parents in crossing 1 (a)

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Answer

Ouers 1: $Bb$
Ouers 2: $bb$

Step 5

Use the Punnett square method to determine the genotypic percentages of the offspring in crossing 2 (a)

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Answer

Die Punnett-vierkantmetode laat die volgende genotypiese persentasie van die nageslag toe:

$BB$ : 0%
$Bb$ : 100%
$bb$ : 0%

Step 6

Calculate the phenotypic percentages of the offspring in crossing 2 (b)

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Answer

Fenotipiese % = ( \frac{4}{4} \times 100 = 100% \text{ Geel} )

'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis - NSC Agricultural Sciences - Question 4 - 2017 - Paper 2

Worked Solution & Example Answer:'n Plant met geel blomme (Y) word met 'n plant met wit blomme (y) gekruis - NSC Agricultural Sciences - Question 4 - 2017 - Paper 2

Identify the marked parts (a) - (e)

State the type of dominance

Give a reason for your answer to QUESTION 4.1.2

Predict the genotype of the parents in crossing 1 (a)

Use the Punnett square method to determine the genotypic percentages of the offspring in crossing 2 (a)

Calculate the phenotypic percentages of the offspring in crossing 2 (b)

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