Mendel crossed two plants with that were heterozygous for purple flower color which genotypes could he have used to represent the cross?

a. PPxPP

b. PpxPp

c. ppxpp

d. PpxPP

What biome does new york state belong too?

In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons.

he human immune system cannot effectively suppress the HIV virus on its own. What key feature of HIV makes it so hard to beat?

What is the flow rate of a freshwater biome

Starting from the process of nitrogen fixation, trace the flow of nitrogen by numbering the steps that follow. : Nitrification occurs to convert ammonium into nitrates. Denitrification occurs to release nitrogen back to the atmosphere.

For Ryan to meet his grain requirements, which group of foods would be his best choice in a single day?

The appropriate unit for defining and measuring genetic variation is the

Assume that a new parasite that infests blue crabs is introduced into the Hudson River, decimating blue crab populations.

Why do bodies of water tend to moderate temperature swings from day to day?

A red flower with a heterozygous genotype for petal color would have a genotype of: A. RR B. rr C. WW D. Rr