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S_A_V [24]
3 years ago
9

When using the forced-choice procedure in measuring odor detection thresholds, the experimenter should _____.​?

Biology
1 answer:
omeli [17]3 years ago
5 0
When using  the  forced-choice  procedure in  measuring  odor  detection thresholds, the  experimenter  should separate  trial  by   about  30 second Forced  force  method  an  experimental    methods which  help to  obtain  threshold.For  a  single   interval and forced  choice method  there  they are  at least  three procedure  for  collecting  data.
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In garden peas, long stems are dominant to short stems, and yellow seeds are dominants to green seeds, too long/yellow pea plant
Lera25 [3.4K]

Answer:

A) 300

B) 3:1

C) 9 long yellow : 3 long green : 3 short yellow : 1 short green

Explanation:

Long stems (L_) are dominant to short stems (ll)

Yellow seeds (Y_) are dominant to green seeds (yy)

We interbred pea plants with long stems and yellow seeds (L_Y_), but they had a short green parent (llyy) that could have only produced <em>ly</em> gametes, so our plants are heterozygous <em>LlYy</em>.

C) We interbred them LlYy x LlYy. If the two genes are unlinked, this is a typical dihybrid cross and from Mendel's law of independent assortment we know that the offspring will have the following phenotypic ratios:

  • 9/16 L_Y_ (Long, yellow)
  • 3/16 L_yy (Long, green)
  • 3/16 llY_ (short, yellow)
  • 1/16 llyy (short, green)

A) 3/16 × 1600 = 300 plants will be long and green.

B)

9/16 + 3/16 = 12/16= 3/4 plants will be yellow;

3/16 + 1/16 = 4/16= 1/4 plants will be green.

The ratio will be 3 yellow : 1 green

6 0
3 years ago
All life on earth shares a common ancestor and more closely related organisms share a more recent common ancestor. A ________ is
Alex777 [14]

Answer:

phylogenetic

Explanation:

The phylogenetic tree shows the relationship of evolution between organisms.  

6 0
2 years ago
The trait for flower color in a plant has red and white alleles. The red color is the dominant trait. What is the phenotypic rat
Aleonysh [2.5K]

Answer:

4 red : 0 white

Explanation:

    R  R

r    Rr   Rr

r    Rr   Rr

Since the dominant allele is RR this means that it will always be red

5 0
3 years ago
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Due to photosynthesis, plants convert Sunlight and Carbon Dioxide into Oxygen. All living things breathe in this gas (Oxygen).




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3 years ago
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Which parts of the spectrum does chlorophyll a absorb best?
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It doesn't absorb green light really well, but it would be blue and red light
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3 years ago
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