Both male and female rats have genotype bb. based on the punnett square, carol concluded that the phenotypic ratio of the monohybrid cross is 2: 1: 1. what mistake did carol make? a) the ratio should be 2: 1 b) the ratio should be 3: 1 c) the ratio should be 2: 1: 1 d) the ratio should be 1: 1: 1: 1

Answer: The ratio should be 3:1.

Explanation:

When the male and female rates with genotype Bb are crossed we get,

Bb X Bb > BB Bb Bb bb

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.