What will be the genotype ratio if you cross two plants with the genotype rr and rr

The genotype ratio will be one.

Explanation:

allele RR produces two same type of gamete, that is R. And allele rr also produces two same type of gamete r.

When we prepare checker board then we found that only one type of genotype will formed. That is Rr(heterozygote).

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.

4) repetitive change