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Valentin [98]
3 years ago
11

PLEASE HELP FAST!!!!! How does sexual reproduction introduces genetic variation into offspring?

Biology
1 answer:
hichkok12 [17]3 years ago
6 0
During meiosis the parent cells are eventually split into four cells that aren't identical at all. During meiosis 1 crossing over occurs which causes the chromosomes to basically get all mixed up
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The oceans cover about 70 percent of the Earth's surface. Ocean water contains salts and we say that ocean water has a certain s
Veronika [31]

Answer:

The salt in the oceans comes from weathering and the erosion of the earth's crust.

Explanation:

The weathering can be described as the breaking down of rocks.

During the weathering of rocks, minerals will be dissolved from the land and salt is one of them. These minerals (salt included) will then be delivered into the oceans by erosion of the Earth's crust.

Erosion can be aided by wind, ice or water. Erosion removed weathered materials. When these weathered materials are removed, new materials (rocks) will be exposed to weathering thereby promoting continuous weathering processes

4 0
3 years ago
Which of the following is an example of succession in an ocean ecosystem?
salantis [7]

Answer:

hydroseres

Explanation:

and for land xeroseres

3 0
3 years ago
Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, h
sergejj [24]
If they are both carriers , we can create a cross with Rr.

The probability of not even carrying PKU is 1/4 or 25%
The probability of carrying is 2/4 or 50%

And the probability of inheriting the disease PKU is 1/4 , 25%

5 0
2 years ago
Describe the vascular system of plants. Include brief descriptions of the characteristics and function of xylem and phloem.
solong [7]

Answer:

The vascular tissue of the plants distributes water and nutrients, which guarantees a constant growth. Each newly formed cell needs to become the corresponding cell type in vascular tissue.

Explanation:

Like animals, plants need water and nutrients. While animals use a circulatory and digestive system to obtain and distribute nutrients, plants use a vascular system. This system absorbs water, vitamins and minerals from the soil and then transmits energy in the form of carbohydrates to the roots. The main components of the vascular system are the xylem and the phloem.

<u>Xylem</u> is a complex tissue formed by several cell types. Its function is the conduction of water and minerals from the root to the leaves. Among the cells that form this complex tissue differ:

- Conductive cells or tracheal elements: they are dead elements at maturity, they serve for vertical conduction and support

- Vessel members are observed in Angiosperms, the largest plant group with the most recent evolution; They are short, wide cells with thick secondary walls, they differ from tracheids because they are perforated elements.

- Storage elements: parenchymal cells, thick walls, secondary, can present crystals and other cellular contents.

- Support elements: fibers in the Angiosperms and fibrotracheids in Gymnosperms, elements of intermediate characters between the fibers and the tracheids.

<u> Phloem</u> cells conduct food (photosynthesis produced by photosynthesis) from the leaves to the rest of the plant. They are living cells at maturity and in histological preparations colored with Astrablue take the color blue. Phloem cells are located outside the xylem.

The sieve elements of this tissue are: the sieve cells in the Gymnosperms and the members of sieve tubes with their respective accompanying cells in the Angiosperms. The accompanying cells retain their nuclei and control the neighboring sieve tubes. Dissolved food, such as sucrose, circulates through the screened areas that connect these cells to each other.

Being a complex tissue, it also has parenchymal cells for storage and fibers and sclereids as a support.

4 0
3 years ago
How are characteristics that suit a species for survival transmitted from one generation to the next?
Bess [88]

The characteristics that suit a species for survival are transmitted from one generation to the next through genes which are the units of hereditary information.

<h3>What is a Gene?</h3>

This is referred to as the basic functional unit of heredity and is composed of DNA which are passed from the parent to the offspring.

This is done through the process which is known as meiosis in which four unique daughter cells are produced.

This is therefore how characteristics that suit a species for survival are transmitted from one generation to the next through the gene and is the most appropriate choice.

Read more about Gene here brainly.com/question/19947953

#SPJ1

5 0
1 year ago
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