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arsen [322]
3 years ago
8

In fruit flies, the allele for white eyes is recessive to the allele for red eyes. In a generation of fruit flies, 45 males with

white eyes, 46 females with white eyes, 44 males with red eyes, and 47 females with red eyes are produced. Which of the following is the best conclusion you can make about the parents of this generation?
Select one:
a. One parent was heterozygous for eye color and the other was homozygous with red eyes.
b. Both parents were homozygous with red eyes.
c. One parent had white eyes and the other was heterozygous for eye color.
d. Both parents were heterozygous for eye color.


While mRNA strands are being created, a sequence is sometimes miscopied. What is the worst that could happen to a cell should this take place?

a. The cell will not make functional proteins from that mRNA strand.
b. The cell will die once it tries to use that strand of mRNA.
c. The cell will have to destroy any ribosomes that use the mRNA strand.
d. The cell will pass the mRNA on to all the cells made from it.


Which of the following would most likely cause a harmful genetic mutation?

a. Insertion of three base pairs into the genetic sequence.
b. Polyploidy mutations, or inheriting an extra set of chromosomes.
c. Chromosomal mutation in germ-line cells are inherited.
d. Exposure to other mutated organisms or cells.


Can someone help me out with these??? The incorrect answers are 1-A
2- D 3-A

Biology
1 answer:
Aleksandr [31]3 years ago
7 0
1 is C - see first attachment. Genotypes with Y's represent males, and big R represents red eyes, while little r represents white eyes. For example XRxr is a heterozygous (red-eyed) female, and XrYr is a homozygous white-eyed male.

2 is B because the absence of functional proteins and some ribosomes due to the mRNA strand is not as detrimental as the loss of the entire cell.

3 is B. (The insertion of 3 base pairs into a genetic sequence is the length of a single codon, meaning that only one amino acid in the entire polypeptide was added) 

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Answer:

1=beach

2=sea

3=longshore current direction

4=incoming waves

5=swash

Explanation:  Longshore currents are affected by the velocity and angle of a wave. When a wave breaks at a more acute (steep) angle on a beach, encounters a steeper beach slope, or is very high, longshore currents increase in velocity. Conversely, a wider breaking angle, gentler beach slope, and lower wave height slows a longshore current’s

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Evaluate each of the statements below. Select those that accurately describe the role of genes and chromosomes in the process of
MaRussiya [10]

Answer:

A) Chromosomes are made of DNA

C) Alleles are the different forms of a gene that can exist

D) Chromosomes contain genes that control the inheritance of traits.

Explanation:

Chromosomes are long molecules of deoxyribonucleic acid (DNA) that contain part (or all) of the genetic material of an organism. Humans contain 46 chromosomes organized in 23 pairs of homologous chromosomes (22 pairs of autosomal chromosomes and one pair of sex chromosomes, X and Y). Moreover, a gene is a physical segment of a chromosome that contains the information to encode a protein. Alleles are different forms of a gene  (i.e., gene variants) that may be caused by mutations or genetic recombination. Humans are diploid organisms (2N: 46), and therefore we have two copies of each gene (alleles), one on each homologous chromosome.

5 0
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Please help
butalik [34]

The right answer is: The antibodies mistakenly identify the cells as foreign material.

The role of an antibody is to recognize a foreign antigen in order to neutralize it. They can achieve this thanks to the great specificity of their paratope, which recognizes only a very precise part of the antigen: the epitope. As soon as an antibody recognizes an epitope, the B lymphocyte that codes for that specific antibody multiplies and matures in order to synthesize the same antibodies, useful in large quantities.

The phenomenon described in the question is an autoimmunity mediated by autoantibodies.

An autoantibody is an antibody produced by the immune system and directed against one or more proteins of the individual himself

Many autoimmune diseases are due to the presence of these autoantibodies, but the presence of autoantibodies is not necessarily synonymous with such a disease.

Some scientists say that they could have a beneficial role in cleaning up cell debris resulting from a disease.

The way in which these autoantibodies are produced, their precise role, and the reason why they decrease in individuals with certain diseases, are all issues that remain unresolved.

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3 years ago
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Alex_Xolod [135]

<u>Answer</u>: Bacteria through the nucleoid (number 5).

<u>Explanation</u>:

Both paramecium and bacteria are single celled organisms. However, they differ by the fact that the first one is an eukaryote and the second one a prokaryote.

Furthermore, they differ in their capacity to mutate and adapt to environmental changes. Bacteria have a simple internal structure that lacks any organelles and are very adept at adapting to environmental changes. Besides their capacity for high mutation rates, they are also capable of picking up genetic information from their environment through a process called <em>transformation</em>.

Through transofrmation, environmental DNA enter the living bacteria through its cell membrane. Double stranded DNA will have one strand dissolved through hydrolysis, whereas the second strand may recombine with the bacterial <em>chromosome (nucleoid)</em>. Thus, this new genetic material will become incorporated into the bacterium's genome.

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3 years ago
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what is Digestion?

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The protein digestion takes place in the stomach as the Ph conditions are favourable for the digestion of proteins the stomach walls release pepsin enzyme for the synthesis of proteins the protein digestion also takes place in small intestine.

Lipids are mostly digested in the small intestines by the help of bile and pancreatic lipases the lipids get  broken down to fatty acids and monoglycerides for easier absorption this process of breaking down fats is called as Emulsification

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