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Delvig [45]
3 years ago
12

A certain species of pine tree survives only in scattered locations at elevations above 2800 meters in the western United States

. To understand why this tree grows only in these specific places, an ecologist should _____.
A) conclude that lower elevations are limiting to the survival of this species
B) study the anatomy and physiology of this species
C) investigate the various biotic and abiotic factors that are unique to high altitude
D) analyze the soils found in the vicinity of these trees, looking for unique chemicals that may support their growth
E) collect data on temperature, wind, and precipitation at several of these locations for a year
Biology
1 answer:
kolezko [41]3 years ago
7 0

Answer:

The correct option is <em>C)  investigate the various biotic and abiotic factors that are unique to high altitude.</em>

Explanation:

The survival of the certain species of pine trees only at elevations shows that there will definitely be a biotic or abiotic factor that enhances the growth of the pines at that place. It might be due to abiotic factors like the temperature or soil at high altitude or due to some biotic factor like a mutualistic relationship with organisms at high altitudes. Hence, option C is the correct option.

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<u>Available data:</u>

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Cross: testcross for (Kk Dd) plants

Parental)   KkDd     x     kkdd

Gametes) KD   kD   Kd   kd      

                kd   kd   kd   kd

Punnet square)        KD        Kd       kD       kd

                      kd     KkDd   Kkdd   kkDd   kkdd

                      kd     KkDd  Kkdd   kkDd   kkdd

                      kd     KkDd   Kkdd   kkDd   kkdd

                      kd     KkDd   Kkdd   kkDd   kkdd

  • Whenever D is present, it inhibits the expression of the K gene, so every plant with the dominant D allele will be white. This plants´ genotype is kkD- or K-D-.
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  • The recessive form for K and D genes will express white-flowered plants, with genotype ddkk

F1) Progeny genotype: 4/16 KkDd, white-flowered plants

                                      4/16 Kkdd, blue-flowered plants

                                      4/16 kkDd, white-flowered plants

                                      4/16 kkdd, white-flowered plants

     The ratio of blue to white offspring in the progeny is 4 blue : 12 white.

     Blue-flowered plants: 4 Kkdd

     White-flowered plants: 4 KkDd + 4 kkDd + 4 kkdd

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