No, I’m not a ‘furry’ just someone interested in genetics…Any PROPER, CONSIDERED, SCIENTIFIC answers please.
If you don’t believe in Adam and Eve as portrayed in the Bible, please do not engage in arguments to the contrary. Just humor me and live with me for a moment in a world where the Bible is true and speculate on how the genetics would have worked.
Assuming the human race started with one man and woman and all races from them, I contend they would be black and probably wooly haired. I’m wondering if my thinking if flawed because I’m looking at it as black skin and black, curly hair as being dominant traits. As far as what’s actually been observed (very important) in science, mutations always take away useful genetic information, not add it, so it seems to me that white could come from black, straight hair from curly hair, but it seems far less likely to me that black could have sprang from lighter skin or curly hair from straight hair. I remember reading a couple of years ago where it was discovered that all blue eyed people descend from the same ancestor who had a genetic mutation (resulting in less pigment) and this sort of sent me on this line of thinking. Is my reasoning flawed?
Acemaster, thx for your contribution, but I do know for a fact that blond hair and blue eyes are recessive traits. Two blond hair, blue eyed people will always have blond haired, blue eyed, kids.
Norm, are you saying that vitamin D production would continue to increase from generation to generation and thus melanin production would increase more and more with each generation that is exposed to more sun? That sounds like skin color is not a matter of genetic characteristic but of the adaptive capability already programmed in the DNA; unless you’re suggesting that somehow the exposure to the sun stimulates changes in the DNA that would result in more melanin production; or perhaps that natural selection would produce the is result as the migrators would begin to feel more and more that black is beautiful.
May somebody help me with these? I got them wrong on my test, and am wondering if you have the correct answer?
Thanks!
Which statement best describes the role of gene expression in cells?
A.
Cells destroy the DNA of genes that they do not use.
B.
To become specialized, cells need to control the production of proteins coded for in their DNA.
C.
All genetic information in a cell’s DNA is fully expressed at all times.
D.
When cells divide in mitosis, they pass on only the genes that are required.
Cells control gene expression at which steps?
A.
transcription, mitosis, and DNA replication
B.
interphase, prophase, and metaphase
C.
transcription, translation, and the formation of the final protein
D.
mitosis, meiosis, and the formation of the final protein
A) plant development is not under genetic control.
B) cell differentiation depends largely on the control of gene expression
C) sexual reproduction is not necessary in plants
D) a cell’s environment has no effect on its differentiation
E) the cells of shoots and the cells of roots have diffrent genes
I know it depends on genetics, and it also varies because of the environment, like for the people from different regions have different bone structures ,like Americans, Africans, Asians, Europeans etc.But what exactly do you think the average height for humans(male and female) should be?
You can answer to orignal question or read my theory and comment.
I don’t even care if it were adam and eve who started this, something did.
We have evidence of early human-like beings that may have been like us but something happened. How did we evolve into what we are now and not have some outside help.
This is going on the crazy side of thinking but just a theory, I have no proof.
Could it be possible that we have been genetically changed by non-earth beings and why, if this scenario was true, would they do this?
If we find another planet and saw semi-intelligent beings and had the knowledge of changing their genetics for them to be able to feel like we do, would we?
Could we advance species into higher evolved beings capable of deep thought and experience?
I mean, the idea of god still can fit in if you want, but I’m not atheist and this could seem like an atheist argument. Anyways, let’s forget “god” for this question? Anyone?
It just doesn’t seem likely with all the forms of life to be an accident.
Thank You for helping me out!
1. Describe three lines of evidence that support eveolution. Give an example for each.
2. Comare the digestive systems of a flatworm and a human.
3. Name the trophic levels in an ecosystem and expalin how energy moves through trophic levels.
4. Describe the following issues that confront modern society: Global Warming and Hazerdous waste.
5. How does gene expression control the development of a frog from a tadpole without legs to a full grown adult??
I need help with this question ASAP! thanks in advance!
Assume that you discovered a fruit fly that walked with a limp and was constantly off balance. Assuming that the limp is an inherited trait (and NOT an injury), what are the possibilities for the focus of gene expression causing the imbalance?
A. is not a carrier of the disorder.
B. will not have the disorder.
C. cannot have offspring with the disorder.
D. will get the disorder late in life.
2. The Punnett square in Figure 7.1 shows a cross between two parents who are heterozygous for an autosomal genetic disorder caused by a recessive allele. People with which genotype will have the disorder?
A. Ss parent
B. ss offspring
C. SS offspring
D. Ss offspring
3. An XX female will express a recessive sex-linked trait if she
A. has several codominant alleles for the gene.
B. fully expresses her Y chromosome.
C. carries the allele on an epistatic gene.
D. is homozygous for the recessive allele.
4. Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that produces albinism. What color fur will the mouse have?
A. Black
B. White
C. Gray
D. Spotted
5. The crossing of wild type fruit flies with mutant fruit flies resulted in the conclusion that some
A. traits are inherited as a group.
B. chromosomes are inherited as a group.
C. genes assort independently.
D. traits assort independently.
6. A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true?
A. Neither has the codominant allele.
B. Both parents have the recessive allele.
C. Her father has an inactivated allele.
D. Her mother carries the dominant allele.
7. If more males than females in a family have a recessive sex-linked disorder, what can you infer about patterns of inheritance in that family?
A. The males would pass on the disorder to sons.
B. All females would be carriers of the disorder.
C. Only females would be carriers of the disorder.
D. Females would not develop the disorder.
8. Down syndrome is characterized by having an extra copy of at least a portion of chromosome twenty-one. Which of the following methods would quickly identify the disorder?
A. Linkage map
B. Meiosis map
C. Karyotype
D. Pedigree chart
9. __________ occurs in cells of female mammals.
A. X chromosome revitalization
B. Y chromosome inactivation
C. X chromosome inactivation
D. Y chromosome expression
10. A plant that is homozygous for red flowers is crossed with a plant that is homozygous for white flowers. The flowers of the offspring are all pink. This is an example of
A. complete recession.
B. incomplete recession.
C. complete dominance.
D. incomplete dominance.
11. Studying genetic disorders has resulted in much of what we know about
A. single-expression dominance.
B. somatic gene disruptions.
C. multiple-gene traits in humans.
D. single-gene traits in humans.
12. Traits that result from many genes are called
A. monogenic traits.
B. multigenic traits.
C. polygenic traits.
D. monolithic traits.
13. Suppose that the cross-over frequency between two genes is 7%. The distance between the two genes on a linkage map is
A. .07 units.
B. .7 units.
C. 7 units.
D. 70 units.
14. Gene expression is influenced by many factors. Which of the following is a factor in gene expression?
A. Karyotype
B. Pedigree
C. Environment
D. Phenotype
15. Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder? (Hint: complete a Punnett square cross on a separate piece of paper.)
A. 25%
B. 50%
C. 75%
D. 100%
16. Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a(n)
A. autosomal trait.
B. sex-linked trait.
C. polygenic trait.
D. codominant trait.
17. The gene linkage map shown in Figure 7.2 shows the order of genes A, B, and C. Which of the following statements about the genes is true?
A. The distance between A and B is 14.5 map units.
B. A and B cross over 2.5% of the time.
C. A and C are linked 8.5% of the time.
D. B and C are most likely to be inherited together.
18. Two genes cross over 6% of the time. This percentage means that the genes are
A. inactivated in 6 out of 100 offspring.
B. incompletely dominant in 6 out of 100 offspring.
C. not inherited together in 6 out of 100 offspring.
D. on *** chromosomes in 6 out of 100 offspring.
19. Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true?
A. Does not have the disorder but can pass it on
B. Will develop the disorder only late in life
C. Cannot pass the disorder to sons, just daughters
D. The allele is not passed on due to Y chromosome inactivation
20. What is the main reason that sex-linked disorders are most often observed in males?
A. The X chromosome only has genes for genetic disorders.
Which of the following types of data can be used to map the locations of genes on chromosomes?
A. Segregation Frequency
B. Rate of Gene Regulation
C. Dominance Patterns
D. Rate of Gene recombination
E. Rate of Gene expression
I think it is A, but I don’t know if I am sure.
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