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3 years ago

What are the parts of the cell cycle in order

Biology

2 answers:

Aleonysh [2.5K]3 years ago

7 0

The in-order steps in the cell cycle consist of interphase, mitosis and cytokinesis.

Interphase contains three phases: G1, S and G2, whereby G stands for gap and S stands for synthesis. The G1 and G2 phases involve growth and preparation for later changes

Mitosis itself consists of five active steps or phases: prophase, prometaphase, metaphase, anaphase and telophase. During prophase, the chromosomes inside the cell's nucleus form tight structures. In prometaphase, the nuclear membrane falls apart and the mitotic spindle connects with the chromosomes. During metaphase, microtubules organize chromosomes in a line along the cell's equator.

Cytokinesis, the physical process of cell division, happens at the same time as mitosis, beginning during anaphase and continuing through telophase. During cytokinesis, the chromosomes and cytoplasm separate into two new daughter cells. Cytokinesis occurs differently in animal and plant cells. In animal cells, the plasma membrane of the parent cell pinches inward along the cell’s equator until two daughter cells form. In plant cells, a cell plate forms along the equator of the parent cell. A new plasma membrane and cell wall form along each side of the cell plate.

Ksju [112]3 years ago

5 0

There many parts of a cell, and different types of cells. Please specify your question further so I can help you on this topic.:)

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What is the main difference between mechanical and electrical waves?

cupoosta [38]

Electromagnetic waves are waves that have no medium to travel whereas mechanical waves need a medium for its transmission. Electromagnetic waves travel in a vacuum whereas mechanical waves do not

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3 years ago

A plant is homozygous for flower color. Its flowers are pink.

Mashutka [201]

The correct answer is A. Flower color is a recessive trait.

The recessive gene does not show its effect in heterozygous condition according to Mendel’s law of dominance. Thus, in heterozygous condition, dominant gene determines the phenotype for a trait. In this question a plant is homozygous for flower color. This indicates that pink flower determining gene can only be expressed in homozygous condition. Therefore, flower color is a recessive trait.

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4 years ago

The factors that affect the climate are *

frosja888 [35]

Answer:

factors effecting the climate

Explanation:

factors effecting the climate

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3 years ago

How could the botanist best determine whether the genotype of the green-pod plant is homozygous or heterozygous?

murzikaleks [220]

Answer:

Explanation:

Homozygosity is when the two alleles (gene form) are the same while heterozygosity is when the alleles are of different types.

In a gene, an allele is capable of masking the expression of another. The allele being expressed or that masks is called the DOMINANT allele while the allele being masked is the RECESSIVE allele.

A recessive allele will only be expressed (phenotypically) if the two alleles are of the same type i.e. homologous but when a dominant phenotype is expressed, one cannot ascertain whether the organism is heterozygous or homozygous for that gene. e.g T is the gene coding for height in plant, T which represents tallness is dominant over t, representing shortness. In a heterozygous (Tt) and homozygous dominant (TT) state, the plant will be phenotypically tall but will only be short in a homozygous recessive (tt) state.

Since the plant will be tall in homozygous (TT) or heterozygous (Tt), we cannot detect the actual genotype of the plant. Hence, a test cross is done.

A test cross is a cross between a dominant phenotype and a homozygous recessive in order to determine the actual genotype of the dominant organism i.e. whether homozygous or heterozygous.

In this case involving pod color gene, since the botanist is trying to determine whether the genotype of the green pod plant is heterozygous or homozygous, it means the allele for green pod is dominant over that of yellow pod (recessive).

N.B: The recessive trait can only be expressed if it is homozygous. Therefore, the yellow pod plant has homozygous recessive genotype.

A test cross is conducted by the botanist to determine whether the green pod plant is heterozygous or homozygous by crossing it with a yellow pod plant (homozygous recessive).

If any of the offspring plants exhibit recessive traits i.e. yellow pods, it means the parent green pod plant is heterozygous but if all the offspring plants show phenotypic dominant traits i.e green pod, it means the parent green pod plant is homozygous.

8 0

3 years ago

Consider two pairs of grandparents. The first pair has 4 grandchildren and the second pair has 32 grandchildren. Which of the tw

schepotkina [342]

Answer:

The second pair of grandparents have approximately 12 to 19 boys as grandchildren.

Explanation:

The probability of a grandchild being a girl or a boy is same, i.e., $\frac{1}{2}$ .

The first pair of grandparents have 4 grandchildren.

The second pair of grandparents have 32 grandchildren.

If first pair of grandparents have between 40% to 60% boys as grandchildren then the number of boys are in the limit,

$(40\%\ of 4,\ 60\%\ of 4)=(1.6, 2.4)\approx(2, 3)$

Thus, the first pair of grandparents have approximately 2 to 3 boys as grandchildren.

If second pair of grandparents have between 40% to 60% boys as grandchildren then the number of boys are in the limit,

$(40\%\ of 32,\ 60\%\ of 32)=(12.8, 19.2)\approx(13, 19)$

Thus, the second pair of grandparents have approximately 12 to 19 boys as grandchildren.

So, it is clear that the second pair of grandparents are more likely to have between 40% and 60% boys as grandchildren.

Also according to the law of large numbers as the sample size increases the probability of an event gets closer to the theoretical probability.

5 0

3 years ago