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3 years ago

How do plants overcome photorespiration?

1 answer:

5 0

Cam plants avoid photorespiration by two mechanisms.Photorespiration refers to the dual affinity of RuBP Carboxylase (aka Rubisco) for carbon dioxide and oxygen. C4 and CAM plants have, over evolutionary time, evolved a different enzyme to serve in the (initial) fixation of carbon dioxide.

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A new human species was found on a distant planet, whose genetic inheritance and process of reproduction is identical to that of

Vedmedyk [2.9K]

Answer:

E/e ; T/t ⇒ Square eyes and long tail (Option D)
3/16 will have round eyes and long tails (Option C)
1/4 of the progeny will be heterozygous for both traits (Option A)

Explanation:

Available data:

Two diallelic unlinked genes
Gene E controls eye shape: Dominant allele E expresses square eyes, and recessive allele e expresses round eyes.
Gene T controls the tail size. Dominant allele T expresses long trail, and recessive allele t expresses short tail.

Genotypes Phenotypes

EETT, EeTT, EETt, EeTt Square eyes and Long tail

eeTT, eeTt Round eyes and Long tail

EEtt, Eett Square eyes and Short tail

eett Rounf eyes and short tail.

1. An individual of this new species is heterozygous for gene E and heterozygous for gene T. What is their genotype and phenotype?

The heterozygous individual is E/e ; T/t, expressing square eyes and a long tail.

2. Two individuals, who are both heterozygous for eye shape and tail size, mate. Which of the following is a correct statement about the phenotype ratios expected for their offspring?

Cross: between two heterozygous individuals

Parentals) EeTt x EeTt

Gametes) ET, Et, eT, et

ET, Et, eT, et

Punnett square) . ET Et eT et

ET EETT EETt EeTT EeTt

Et EETt EEtt EeTt Eett

eT EeTT EeTt eeTT eeTt

et EeTt Eett eeTt eett

F1) Genotype:

1/16 EETT
2/16 EETt
1/16 EEtt
2/16 EeTT
4/16 EeTt ⇒ 1/4 EeTt
2/16 Eett
1/16 eeTT
2/16 eeTt
1/16 eett

Phenotype

9/16 E-T-, Square eyes and Long tails
3/16 E-tt, Square eyes and short tails
3/16 eeT-, Round eyes and Long tails
1/16 eett, round eyes and short tail

Phenotypic ratio 9:3:3:1

3. From the mating described in question ABOVE, what proportion of ALL of the offspring in will be heterozygous for both traits?

4/16 = 1/4 = 25% of the progeny are expected to be heterozygous for both traits, EeTt.

7 0

3 years ago

24. An investigator examines voltages resulting from changes in membrane permeabilities. If the cell membrane suddenly had 100 p

omeli [17]

Answer:

Generally, K+ ions ensures re-polarization of the membrane potential. It always ensures that the neuron returns its resting state, protecting the neurons and ensuring episode of rest before the next action potential.

K+ does this by leaving the axon, making the inner layer more negative. This is resting membrane potential. Because there are many K+ channels for leakages out of the neuronal axons.

Therefore, in this scenario, he neuron will return to its resting membrane potential state which between values -50 to -75mV.

Therefore the value of the potential will be -60mV, or within the range of -50 to -60mV. This is because the neuron is is non- excitable.

Explanation:

7 0

3 years ago

What are the function of chloragogen Cell in earthworm

Nikolay [14]

Explanation:

The cells store glycogen and neutralize toxins and are present in coelomic fluid of some annelids. They are yellowish in colour due to the presence of yellow granules called chloragosomes.

These cells are derived from the inner coelomic epithelium, and help in excretory functions, as most commonly demonstrated in earthworms.

5 0

3 years ago

Vineyards and orchards operate all year round. What are some practices from the recommended list of physical/cultural control th

Sloan [31]

Answer:

Some practices from the recommended list of physical/cultural control that you could do year-round to help control pests are as follow:

1. We can use those plant species that are more competitive. These plant species include release of chemical toxins that suppress other plants and insects.

2. Use of large Hight quality seeds.

3. By using narrow spacing in row and increasing seeding rate.

4. By using shallow seeding technique which allow desired plant species to grow and develop faster above the surface of soil.

5. By ensuring that our plant species is perfectly placed in that growing environment which is optimized with every specs.

6. By rotating the crops

7. By rotating plant species with different growing cycles and seasonal cycles.

8. By rotating herbicides with alternative modes of action to delay the herbicide resistance development.

8 0

3 years ago

What is the function of chlorophyll a?

12345 [234]

Answer:

photosynthesis

Explanation:

Chlorophyll a absorbs the wavelengths of violet-blue and orange-red light and functions as a primary electron donor during the election transport chain in photosynthesis. It also functions in transporting energy to the reaction center where P680 and P700 are located.

7 0

4 years ago

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