A red-flowered pea plant is crossed with a white-flowered pea (assumed homozygous recessive ww). The cross produces 53 red and 47 white offspring out of 100.
What does this 1:1 ratio reveal about the red-flowered parent?
- A
It is homozygous recessive (ww)
- B
Color is environmentally determined
- C
It is homozygous dominant (WW)
- Dcheck_circle
It is heterozygous (Ww)
Explanation
A test cross of the unknown red parent with white (ww) yields 1:1 if the red parent is Ww (Ww x ww gives 1/2 Ww red, 1/2 ww white). A WW parent would give 100% red.