Two varieties of maize, one with purple grains and the other with yellow grains, were crossed, and all their offspring had yellow grains. Show the result of the cross between the F1 generation and the

The problem states that two varieties of maize, one with purple grains and the other with yellow grains, were crossed, and all their offspring had yellow grains. This indicates that yellow grain color is dominant over purple grain color.

Let:

• Y = allele for yellow grains (dominant)
• y = allele for purple grains (recessive)

Since all F1 offspring are yellow, and one parent was purple (yy), the yellow parent must have been homozygous dominant (YY) to ensure all offspring receive a dominant allele.

P Generation Cross: Yellow grains (YY) $\times$ Purple grains (yy)

Gametes from YY: Y
Gametes from yy: y

F1 Generation Punnett Square:

$$\begin{array}{|c|c|} \hline \text{Gametes} & \text{Y} \\ \hline \text{y} & \text{Yy} \\ \hline \end{array}$$

a) (i) Deduce the genotype of the grains of the First Filial generation.
The genotype of all the grains in the First Filial (F1) generation is $\boxed{\text{Yy}}$.

a) (ii) Show the result of the cross between the First Filial generation and the Parent Purple variety using labelled diagrams only.
Cross: F1 generation (Yy) $\times$ Parent Purple variety (yy)

Gametes from F1 (Yy): Y, y
Gametes from Parent Purple (yy): y, y

Punnett Square for F1 $\times$ Parent Purple:

$$\begin{array}{|c|c|c|} \hline \text{Gametes} & \text{Y} & \text{y} \\ \hline \text{y} & \text{Yy} & \text{yy} \\ \hline \text{y} & \text{Yy} & \text{yy} \\ \hline \end{array}$$

Genotypes: $50\%$ Yy, $50\%$ yy
Phenotypes: $50\%$ Yellow grains, $50\%$ Purple grains

a) (iii) Mention two ways in which the application of genetics is beneficial to manufactured food agriculture.
Two ways in which the application of genetics is beneficial to manufactured food agriculture are:

• Increased Yield and Quality: Genetic engineering and selective breeding allow for the development of crop varieties with higher yields, improved nutritional content, and better resistance to pests and diseases, leading to more efficient food production.
• Enhanced Shelf Life and Processing Traits: Genetic modifications can extend the shelf life of produce, reduce spoilage, and introduce traits that make crops easier to process into manufactured food products (e.g., specific starch compositions for better texture in processed foods).