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Sphinxa [80]
3 years ago
8

. Which of the following is a chemical reaction? A. breaking a glass pane B. freezing water C. digestion of food D. cutting down

a tree E. evaporation of rubbing alcohol
Biology
2 answers:
katen-ka-za [31]3 years ago
8 0

Answer:

C. When we digest food there are tons of chemical reactions occurring in the process, they would have to break down the food which is a chemical reaction.

ad-work [718]3 years ago
7 0

Answer:

C. digestion of food

Explanation:

in a chemical reaction the substance changes composition and the reaction is mostly irreversible.

option C: digestion of food is a chemical reaction which changes the composition of the food we eat. Enzymes and other substances react with the food and turn it into soluble substances which the body can easily use.

option A: breaking glass does not change the composition of the glass plane. Its a physical reaction

option B: freezing water changes the state of water but the composition is still     the same, its a physical reaction as well.

option D: cutting a tree does not change the composition of the wood. This, too, is a physical reaction.

option E: when a liquid evaporates it changes into a gas, which is a change in the state of matter (just like water into ice), this also does not change the composition of alcohol.

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Why does the expected genotypic ration often differ from the expected phenotypic ratio resulting from monohybrid cross
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Answer:

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In humans, the eye color and hair color genes are located on different chromosomes. Brown eyes (B) are dominant to blue (b), and
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Answer:

Man's genotype: Bbdd

Woman's genotype: bbDd

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Explanation:

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According to the question, A man with brown eyes and red hair will possibly possess genotypes: BBdd or Bbdd while a woman with blue eyes and dark hair will possibly have genotype: bbDD or bbDd. Considering the fact that they produced children with recessive traits for both gene (blue eyes and red hair), it means that they are heterozygous for their dominant trait. This means that the ideal genotype for the man is Bbdd since he will produce gametes containing B and b alleles for the first gene while the ideal genotype for the woman is bbDd since it will produce gametes with D and d allele for the second gene.

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