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kow [346]
3 years ago
12

Tracers are elements that ____.

Biology
1 answer:
OlgaM077 [116]3 years ago
7 0

Tracers are defined as elements that can be monitored through biochemical reactions. This characteristic of tracers makes them useful for the exploration of the mechanism of chemical reactions by tracing the path that the they follow from reactants to products. A good number of complex biochemical reactions (e.g. photosynthesis) have been studied using tracers.

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Explanation:

<em>Let the ability to break down the red color in beets be represented by the allele </em><em>B</em><em>. The inability would be represented by the allele </em><em>b</em><em>.</em>

A nonsecretor's genotype would be BB or Bb while a secretor's genotype would be bb.

A nonsecretor woman with a secretor father would be a carrier with genotype Bb. A nonsecretor man who in a previous marriage had a secretor daughter would also be a carrier with genotype Bb. If the two marries:

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1.

(a) probability of their first child will be a secretor girl = probability of having a girl and being a secretor.

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<em>probability of their first child will be a secretor girl</em> = 1/2 x 1/4 = 1/8

(b) Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor.

Probability of having a girl = 1/2

Probability of being a nonsecretor = 3/4

<em>Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor</em> = 1/2 x 3/4 = 3/8

2. <em>Probability that their first two children will be nonsecretors of either sex = probability of their first being a nonsecretor and of either sex and probability of their second being a nonsecretor and of either sex.</em>

  = 3/4 x 3/4 = 9/16

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