BIOLOGY MIDDLE SCHOOL

Contrast one major difference between selective breeding and genetic engineering

Answers

Answer 1
Answer: Selective breeding is where humans choose individual of the same species that have a trait that favors economic growth or any other benefits, then breeding these favorable species until most of the population are the species with the favorable genes. Meanwhile, genetic engineering is where human alters, changes, inserts DNA to modify organisms.

Therefore, one major difference is that selective breeding does not include altering the DNA, while genetic engineering is the altering of DNA.

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Carbon is a vital part of the phospholipids that make up cell membranes and the carbohydrates that make up cell walls. Which of the following allows carbon to bond with up to four other atoms at a time and form the macromolecules that are essential to life? A. the six protons in its nucleus B. the six neutrons in its nucleus C. the two electrons in its inner shell D. the four electrons in its outer shell

WILL GIVE BRAINLIEST!!! HELP ASAP!!!Which of the following statements is true? Electrons are found in the nucleus. A piece of magnesium is made only of magnesium atoms. All 118 elements occur naturally on Earth. Protons and neutrons orbit the nucleus of an atom.

Answers

Answer:

The last one

Explanation:

They are both found in the middle and everything else is false

Answer:

A.

Explanation:

B. is wrong bc they don't occur naturally

toucans eat fruits that grow high in trees.What feature of the toucan's body structure might be an adaptation? Explain

Answers

their wings because they have to fly

Which is true regarding all X-linked disorders?Group of answer choices

they result in a longer lifespan

they are caused by mutations of the X chromosome

they are linked to an unknown chromosome

they are disorders that affect only women

Answers

Answer:

they are caused by mutations of the X chromosome

Explanation:

The X chromosome contains many genes in addition to those that determine sex. Certain hereditary defects determine by recessive genes are linked to the X chromosome. The disorders are caused by mutations of the X chromosomes.

A student pushes against a tree with a force of 10 newtons (N). The tree does not move. What is the amount of force exerted by the tree on the student?1) 0 N
2) 5 N
3) 10 N
4) 20 N

Answers

The  amount of force exerted by the tree on the student is 10 N

Given that,

  • A student pushes against a tree with a force of 10 newtons (N). The tree does not move.

Based on this, we can say that

  • The amount of force should be same as each & every action should be equivalent & in the opposite reaction as the newton third law of motion.

Therefore we can conclude that The  amount of force exerted by the tree on the student is 10 N

Learn more: brainly.com/question/6201432
10 newtons (N). If the tree had less, it would be pushed. If it had more, it would push the kid (not possible).

PKU (Phenylketonuria) is an autosomal recessive disease, in which the synthesis of amino acid Tyrosine from Phenylalanine is blocked. As a result, an excess of Phenylalanine gets converted into phenylketones, which appear in the urine. In severe conditions it may also result in damage to the brain.The gene responsible for this is p, whereas the gene P is responsible for normal synthesis of Tyrosine. In a small population of Brazilian natives, the frequency of gene p, responsible for this disease, is 0.3. What must be the frequency of people who are heterozygous for this disease? ( p + q = 1, p2 + 2pq + q2 = 1) A.0.56
B.0.35
C.0.42

Answers

The answer is; C

Use the Hardy Weinberg equiation for population in assumed equilibrium. ( p+q = 1)

If p = 0.3 then q=1-p = 1-0.3 = 0.7

People who are heterozygous for the disease are represented by 2pq = 2 * 0.3 * 0.7

0.42


Identify the error that occurred in Meiosis II.A)Homologous chromosomes failed to separate, resulting in polyploidy.
B)Homologous chromosomes failed to separate, resulting in recombination.
C)Homologous chromosomes failed to separate, resulting in nondisjunction.
D)Homologous chromosomes failed to separate, resulting in independent
assortment

Answers

Answer:

The correct option is C) Homologous chromosomes failed to separate, resulting in non-disjunction.

Explanation:

Non- disjunction can be described as a phenomenon in which the chromosomes fail to separate during cell division, resulting in both the chromosomes being transferred to a single gamete.

Non- disjunction can occur in three types:

  1. Non- disjunction can occur at the time of meiosis when the sister homologous chromosomes fail to separate.
  2. It might occur in mitosis when sister chromatids fail to separate.
  3. It might occur in meiosis II when sister chromatids fail to separate.

Answer:

c

Explanation:
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