Question

in some plants red (r) flowers are dominant to white (r) flowers. two heterozygous red flower plants are crossed with each other.

| question | answer

1 | what percentage of the offspring will be homozygous dominant? |
2 | what percentage of the offspring will be heterozygous? |
3 | what percentage of the offspring will be homozygous recessive? |
4 | what percentage of the offspring will have red flowers? |
5 | what percentage of the offspring will have white flowers? |

Explanation:

Step1: Set up Punnett Square

Parent genotypes: $Rr$ (heterozygous red) × $Rr$ (heterozygous red).

	$R$	$r$
$r$	$Rr$	$rr$

Step2: Count genotype frequencies

• Homozygous dominant ($RR$): 1 out of 4
• Heterozygous ($Rr$): 2 out of 4
• Homozygous recessive ($rr$): 1 out of 4

Step3: Calculate percentage for Q1

Homozygous dominant % = $\frac{1}{4} \times 100 = 25\%$

Step4: Calculate percentage for Q2

Heterozygous % = $\frac{2}{4} \times 100 = 50\%$

Step5: Calculate percentage for Q3

Homozygous recessive % = $\frac{1}{4} \times 100 = 25\%$

Step6: Calculate red flower %

Red flowers = $RR + Rr$ = 3 out of 4. % = $\frac{3}{4} \times 100 = 75\%$

Step7: Calculate white flower %

White flowers = $rr$ = 1 out of 4. % = $\frac{1}{4} \times 100 = 25\%$

Answer:

1. 25%
2. 50%
3. 25%
4. 75%
5. 25%