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Reika [66]
4 years ago
6

What is a pollen grain?

Biology
1 answer:
Slav-nsk [51]4 years ago
6 0

Answer:

Hope This Helps :)

Explanation:

Pollen Grain. A reproductive structure that contains the male gametes of seed plants. Pollination. The transfer of pollen from the male part to the female part of a seed plant.

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1. A dominant gene (A) causes yellow color in rats, the dominant allele on another independent gene (R) produces black coat colo
Novosadov [1.4K]

Answer:

Parents: Yellow (Aarr) and Grey (AaRr)

Explanation:

Given:

allele A = yellow

allele R = black,

Heteroozygous = gray

Genotypes of the parents:

yellow (Aarr) - female

gray (AaRr) - gray

cross between these

Parents: Yellow (Aarr)  and Grey (AaRr)

Gametes: (Ar, ar) and (AR, Ar, aR, ar)

F1 (Punnet square)

----|----- AR ------|------- Ar ------|------ aR -----|----- ar

Ar | AARr (gray) | AArr (yellow) | AaRr (gray) | Aarr (yellow)

ar | AaRr (gray) | Aarr (yellow) | aaRr (black) | aarr (cream)

Ratio: 3/8 yellow : 3/8 gray : 1/8 cream : 1/8 black

6 0
3 years ago
An older adult client with a diagnosis of left-sided stroke is admitted to the facility. To prevent the development of disuse os
worty [1.4K]

This question is incomplete. Here´s the complete question.

A 70-year-old client with a diagnosis of left-sided stroke is admitted to the facility. To prevent the development of disuse osteoporosis, which objective is most appropriate?

a) Promoting range-of-motion (ROM) exercises

b) Promoting weight-bearing exercises

c) Maintaining protein levels

d) Maintaining vitamin levels

Answer: b) Promoting weight-bearing exercises

Explanation:

The bone is a living tissue that becomes stronger with exercise.  Weightlessness and immobility can lead to bone loss.  

Weight-bearing exercises are those that force us to work with gravity, like walking, hiking, jogging, climbing stairs, playing tennis, and dancing. They can help prevent disuse osteoporosis.

On the other hand, swimming and bicycling would be examples of non-weight-bearing exercises.

4 0
4 years ago
Imagine taking a bite of a pizza. Briefly discuss the role that each part of the brain takes in this simple act. Medulla, Pons,
Anon25 [30]

Answer:

- Medulla: transmits signals between the spinal cord and higher brain levels

- Pons: transmits impulses related to the voluntary skeletal movements from the cerebrum to the cerebellum

- Cerebellum: coordinates skeletal muscle contraction, conscious/subconscious movements, maintains muscle posture, and balance

- Thalamus: regulation of the human nervous system

- Hypothalamus: maintains the overall homeostasis of the body

- Amygdala: processes fearful and threatening stimuli  

- Hippocampus: regulates learning, memory encoding and consolidation, and spatial navigation

- Parietal Lobe: processes information from the outside world (e.g., touch, taste, temperature)

- Occipital Lobe: interprets information from the eyes

- Temporal Lobes:  process sensory information (i.e., pain and auditory stimuli)

- Frontal Lobe:  higher cognitive functions (e.g., memory, problem-solving, emotions, impulse control, etc)

Explanation:

The medulla (medulla oblongata) is the lowest portion of the brainstem, which is linked by the pons to the midbrain and continues with the spinal cord. The medulla is known to transmit signals between the spinal cord and higher brain levels, thereby controlling autonomic activities (e.g., heartbeat and respiration). The pons is a mass of transverse nerve fibers that links the medulla with the cerebellum, it transmits signals from the forebrain to the cerebellum. The pons is involved in different functions, e.g., sleep, respiration, hearing, equilibrium, taste, eye movement, swallowing, bladder regulation, facial expression, etc. The cerebellum is a small part of the brain involved in physical movements (e.g., posture, balance, coordination), which receives sensory information from sensory systems, the spinal cord, and different parts of the brain. The cerebrum is the largest part of the brain, it is involved in speech, thinking, reasoning, problem-solving, emotions, initiating/coordinating movements, regulating temperature, learning, etc. The thalamus is a mass of gray matter located in the forebrain which is involved in diverse functions (i.e., relay of sensory signals, regulation of consciousness, sleep, alertness, etc). The hypothalamus is a small, central, area of the brain that connects the nervous to the endocrine system that acts to maintain the overall homeostasis of the body. The amygdala is a structure located in each hemisphere of the brain that processes fearful and threatening stimuli. The hippocampus is a structure located in the depths of the temporal lobe that regulates learning, memory encoding and consolidation, and spatial navigation. The parietal lobe is located at the upper back area in the skull, it is involved in processing sensory information from the surrounding world (e.g., touch, taste, temperature). The occipital lobes are responsible for transmitting visual information to the temporal lobes, and they are also associated with memory skills. The frontal lobe is the most anterior part of the brain, which is involved in higher cognitive functions (e.g., social interaction, motor function, memory, emotions, impulse control, problem-solving, etc).

3 0
3 years ago
The blood osmotic pressure of marine teleosts is about _____ mOsm _____ than the environmental osmotic pressure.
Feliz [49]

The blood osmotic pressure of marine teleosts is about <u>600</u> mOsm <u>higher </u>than the environmental osmotic pressure.

Osmotic pressure is the minimal pressure required to prevent the inward flow of a solution's pure solvent across a semipermeable membrane. It is also described as the measure of a solution's capacity to take a pure solvent through osmosis.

All freshwater organisms maintain hyperosmotic blood osmotic pressures in fresh water. Blood osmotic pressure in freshwater teleosts is 300 mOsm higher than freshwater osmotic pressure.

Teleost is most hyposmotic to seawater. Because marine teleosts are hyposmotic to saltwater, they experience osmotic loss of water and NaCl diffusional gain through the gill.

Learn more about osmotic pressure here: <u>brainly.com/question/10046758</u>

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#SPJ4

7 0
2 years ago
What are the products of aerobic respiration?
vfiekz [6]
B Carbon dioxide, water, and ATP
6 0
3 years ago
Read 2 more answers
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