If purple flowers are dominant in a plant and white flowers are recessive in that plant, then when purple-flowered plants with two dominant genes are mated with white-flowered plants with two recessive genes, the first generation of offspring should have...
A) 100% white flowers
B) 75% purple flowers and 25% white flowers
C) 50% purple flowers and 50% white flowers
D) 100% purple flowers
it would be D! :)
im not sure but idk where the answer is ???
To answer this question, we need to understand the principles of genetic inheritance. In this scenario, purple flowers are dominant and white flowers are recessive.
When purple-flowered plants with two dominant genes (PP) are mated with white-flowered plants with two recessive genes (pp), the possible genotypes of their offspring would be:
- Purple flower: Pp (heterozygous)
- Purple flower: Pp (heterozygous)
- White flower: pp (recessive)
- White flower: pp (recessive)
Since the purple-flowered plants have two dominant genes and the white-flowered plants have two recessive genes, all the offspring will inherit one dominant purple gene (P) from one parent and one recessive white gene (p) from the other parent. Therefore, the first generation of offspring should have:
B) 75% purple flowers (Pp) and 25% white flowers (pp)
To determine the first generation of offspring from mating purple-flowered plants with two dominant genes (PP) and white-flowered plants with two recessive genes (pp), we can use Punnett squares.
Step 1: Write out the genotypes of the parents:
- Purple-flowered plants with two dominant genes: PP
- White-flowered plants with two recessive genes: pp
Step 2: Fill in the Punnett square with the parent genotypes:
```
| P | P |
--------------
p | Pp| Pp|
p | Pp| Pp|
```
Step 3: Determine the phenotypes of the offspring:
- Purple-flowered plants (PP or Pp) have purple flowers
- White-flowered plants (pp) have white flowers
Looking at the Punnett square, we can see that all the offspring (100%) will have a genotype of Pp, which corresponds to purple flowers.
Therefore, the correct answer is D) 100% purple flowers.