A substance that speeds up the rate of a chemical reaction is called a Catalyst.
Answer:
frontal lobe
Explanation:
There are four types of lobes of the brain: the frontal lobe; the occipital lobe; parietal lobe; and the parietal lobe. Occipital, parietal and temporal lobes control and regulates functions of that has to deal with touch, movement, taste, temperature, and vision.
The frontal lobe, which is the largest lobe, is primarily responsible for cognition and emotional functions.
Answer:
Let the "barred" allele be caller B and the "non-white" allele b. Since chickens use chromosomes 
and 
to determine sex, hens would have chromosomes 
, and roosters would have chromosomes 
. A Z-linked gene is represented as a superscript on the chromosome, 
for the dominant allele and 
for the ressesive allele.
A barred hen would have a copy of B on its Z chromosome, a non-barred rooster would have both copies of b on both Z chromosomes. Using Punnet squares to represent the crosses we get the following cases:
That is a ratio of two barred heterozygote roosters to two non-barred hens. Crossing them we get:
That is a ratio of one barred heterozygote rooster to one barred hen to one non-barred rooster to one non barred hen.
