All categories

3 years ago

2 ways in which cross pollination is occurred

Biology

1 answer:

hichkok12 [17]3 years ago

6 0

By insects: When a bee, butterfly, etc. try to get the sticky sweet pollen inside a flower, the pollen catches on to the insect, too. Then when the insect goes to the next flower, the pollen in pollinates. Note that this is not on purpose.

2. Another way plants are pollinated is by the wind. The wind picks up pollen from one plant and blows it onto another. Note that this is by nature.

I hope that helps! :)

You might be interested in

A cross between two individuals that are heterozygous for eye and skin color would be an example of a _____ cross.

8090 [49]

A cross between individuals that are heter0zyg0us for two different traits is a dihybrid cross. A cross between two individuals that are heterozygous for eye and skin color would be an example of a _dihybrid_ cross.

----------------------

Dihybrid crosses involve individuals that expresses two different traits and are heter0zyg0us for each of them.

So let us imagine we are studing the characters eye color and skin color. Let us assume that both of them are coded by single diallelic genes.

For eye color there is

Dominant allele B that codes for brown eyes
Recessive allele b that codes for blue eyes

For skin color there is

Dominant allele A that codes for black skin
Recessive allele a that codes for white skin

So, an individual that is heter0zyg0us for both of them, is BbAa.

If this person crosses to another person with the same genotype, we are talking about a dihybrid cross, because two dibybrid individuals are involved.

Cross: BbAa x BbAa

According to this information, we can aswer the question:

When crossing two individuals that are heterozygous for eye and skin color we are referring to a dihybrid cross.

-----------------------------------

Learn more about dihybrid crosses at

brainly.com/question/1185199?referrer=searchResults

brainly.com/question/24076691?referrer=searchResults

6 0

2 years ago

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

Which of the following is a difference between the light-dependent and the light independent reactions of photosynthesis?

Blababa [14]

Answer:light dependent depends upon light to be successful also Hydrogen and oxygen are produced while dark reaction is against all also glucose is produced

7 0

3 years ago

A man is 1.7 m long. An amoeba is 17 um long. How does the length of the

grandymaker [24]

A man is 100,000 times larger in micrometers than the amoeba, since 17 micrometers is 0.000017 meters, and 1.7 meters is 1,700,000 micrometers

5 0

3 years ago

List tim''s symptoms and identify the organ system (or specific organ) associated with those symptoms. (your may need to referen

pantera1 [17]

1. Tim's symptoms include deteriorated coordination, stamina and school performance, nausea, painful joints and an abnormal increase in growth rate. His personality also changed which manifested as depressive mood, introversion, anxiety and tension. These symptoms could indicate an endocrinological problem, therefore the organ system which could be associated with them is the thyroid gland.

2. The thyroid gland is an organ of the endocrine system which is located in the neck, behind Adam's apple. It regulates metabolism, protein synthesis and development. It does so by producing a number of hormones: calcitonin, thyroxine and triiodothyronine. The two thyroid hormones (thyroxine and triiodothyronine) regulate the body's metabolism by controlling the way cells produce and consume energy.

3. Hyperthyroidism is an endocrine condition in which there is an overproduction of thyroid hormones by the thyroid gland. Under these conditions, the thyroid gland proves to be overactive and the main symptom is the acceleration of the metabolism. Tim's sudden increase of growth rate and inability to gain weight, along with his nervousness and mood swings, and his fatigue and loss of energy could indicate a problem of hyperthyroidism.

4. Cortisol is a steroid hormone which is produced by the thyroid gland. It is often called as the "stress hormone" as it is released in response to a stressful situation. It is also released in response to low blood glucose concentration. Some of cortisol's functions are the increase in blood sugar, the suppression of the immune system and bone formation. Cortisol is also involved in the metabolism of macronutrients.

5 0

3 years ago