BIOLOGY HIGH SCHOOL

in humans, a combination of XX chromosomes results in a female zygote and that of XY result in a male zygotes. From whom does the a male zygotes inherit an X chromosome

Answers

Answer 1
Answer: The answer is: from mother

In a human diploid somatic cell (2n), there are in total 46 chromosomes - 22 autosomal chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes. In males, there is one X and one Y chromosome (XY) while in females, there are two XX chromosomes (XY).
During the formation of gametes, a female could give only X chromosomes, so gametes from the mother contain one X chromosome. But, a male could give X or Y chromosome, so gametes from the father contain either X or Y chromosome.
Female gamete and male gamete fuse to form a zygote. Male zygote must contain both X and Y chromosome. It inherits Y chromosome only from the father, so X chromosome must be inherited from the mother.

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In what way are plants in a sunny meadow and sulfur bacteria in a deep sea vent alike

Answers

the correct answer is that both both produce carbohydrates and water. Plants to do it in a process called photosynthesis, and they produce oxygen as well and sulfur bacteria do it in a process called chemo-synthesis, and they produce sulfur apart from carbohydrates and water.

Answer:

Lesson 2: Energy Roles of Organisms

Explanation:

1. B. They both produce carbohydrates

2. B. They both obtain energy by consuming other organisms.

3. C. Carnivore, Consumer

4. A. A decomposer  breaks down organic compounds in dead organic matter, and a detritivote eats dead and decaying mater.

 

Plants have a cell wall made of cellulose. What is the function of the cell wall in plants? A) The cell wall controls division of the cell. B) The cell wall provides structure to the cell. C) The cell wall controls the functions of the cell. D) The cell wall manufactures proteins for the cell.

Answers

The main job of the cell wall made out of cellulose would be to provide structure to the cell - B. 

Having structure through the cellulose present in cell walls is essential for plants because their structure often also dictates their function. 

A the cell wall controls division of the cell

A particular gene does NOT constantly churn out the same protein at all times in every cell. This is true for two reasons. First, _____ can allow one gene to produce several different proteins. Second, genes are constantly being turned on and off through the process of _____.

Answers

mRNA processing and Gene regulation

Explanation:

  • A particular gene does NOT constantly churn out the same protein at all times in every cell. This is true for two reasons. First, mRNA processing can allow one gene to produce several different proteins. Second, genes are constantly being turned on and off through the process of gene regulation.

The process by which a pre-mRNA undergo various  modification so that it can become a mature RNA is called RNA processing . During RNA processing, splicing is an important step. During splicing, the introns are precisely excised and exons are ligated together. A process of alternative splicing is excised by which more than one mRNA species can be produced from a single pre-mRNA. Thus mRNA processing is the method that allows  a gene to produce different proteins. secondly, the regulation of genes initiate the control of gene products.

Some organisms have favorable traits that are well-suited to the environment in which they live. Organisms with this advantage are more likely to thrive, reproduce, and pass their traits to future generations than organisms without favorable traits.. . This process is known as__. A. geographic isolation.. B. reproductive isolation.. C. natural selection.. D. mimicry.

Answers

Answer is option C that is natural selection.
C. natural selection. 

What part of the nervous system is essential for it to work properly?

Answers

Brain. :) that's your answer haha

Why is it more common for doctors to recommend amniocentesis and cvs for women over the age of 35?

Answers

Answer:

The age of 35 years was established to offer invasive techniques, because at this age the risk of secondary abortion was balanced by the technique and the risk of chromosomal alteration.

Explanation:

The possibility of early diagnosis of fetal anomalies of various kinds (neural defects, chromosomopathies, etc.) has been one of the top concerns of gynecologists and geneticists, for obvious reasons.

Throughout these years, prenatal diagnostic techniques have been developed that allow therapeutic decisions by doctors or viability of pregnancy by parents. These techniques are initially performed with non-invasive methods (biochemical determinations, ultrasound), and if the suspicion is increasing, it is passed to more invasive techniques such as amniocentesis or chorionic villus biopsy.

Given that in the latter there is a risk of loss of pregnancy, it is previously attempted to ensure that the indication is correct, and for this, new biochemical tests and risk calculation systems have been added.

Until recently the criterion for establishing the risk of fetal chromosomal abnormality was the mother's age, since there was a clear relationship between maternal age and chromosomal abnormalities, especially Down. The age of 35 years was established to offer invasive techniques, because at this age the risk of secondary abortion was balanced by the technique and the risk of chromosomal alteration. The problem was that a small number of cases were detected. Therefore, other parameters have been sought that estimate more precisely those subsidiary chaos of early detection.

The estimation of the risk in a given pregnant woman is done by multiplying the risk associated with her age for the specific gestational age.

Currently, most prenatal tests consist of AFP, estriol and human chorionic gonadotropin (hCG), which is the triple test, which is a blood test that assesses the risk in a pregnancy of having a Down syndrome or spina bifida It is not a test that tells us whether or not the fetus has any of these defects. It is a test that tells us the probability of risk of having them. Studies have shown that about 70% of fetuses with Down syndrome can be identified early combining the analysis of the mother's age and the results of the triple test.
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