The correct answer is Rr and rr.
F1: Rr x rr
F2: Rr Rr rr rr
F1 is the first generation, parents
F2 is the possible genotypes fo offspring
It means that there is 50%possibility for heterozygous (red eyed) and 50% for homozygous (sepia eyed).
Speciation can be difficult to observe in nature, but the it is hypothesized that the following occurs in a allopatric speciation's intermediate stage:
(1) closely related species are differentiated through geographic variation (2) then there's reduced fertility in one a geographic race of the species (3) and in the geographic race of subspecies that are to become species.
Absolute refractory period -
the period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is administered
Answer:
Explanation:
I think it's animal respiration because animals inhale oxigen and they exhale carbon dioxide.
The defining abiotic factor of deserts is the amount of rainfall which is relatively very little in deserts. Desert climates can be found almost everywhere in the world.
