Can someone please help me with my Biology Homework!?
vampriechick Asked: Can someone please help me with my Biology Homework!?
I need some help with my homework! This chapter is very difficult 
Thanks in advance!
1-Explain whether a male could be heterozygous for red-green color blindness.
2-What types of phenotypes would one look for if a phenotype were due to polygenic inheritance?
3-Summarize the meaning of the following information regarding trait inheritance: For a certain, identical twins have a concordance rate of 54% and fraternal twins have a rate of less than 5%.
4-What could explain a human karyotype showing 47 chromosomes?
a) monosomy b) trisomy
c) codominance d) dominant traits.
5- Which statement concerning telomeres is not true?
a) they are found on the end of chromosome.
b) they consist of DNA and sugars.
c) They protect chromosomes.
d) Replication is a problem in most cells.
6- What characteristics are associated with Down syndrome?
7- Most cases of trisomy and monosomy in humans are fatal. Why might this be?
8-Hypothesize why chromosomes need telomeres.
9- Explain why a girl who has Turner's syndrome has red-green color blindness even though both of her parents have normal vision.
10- Illustrate what might have occured to result an extra chromosme in the following example: A technician is constructing a karyotype from male fetal cells. The technician discovers that the cells have on extra X chromosome.
Thank you for everyone who answers!
Answers:
b
1. To answer this question, you need to know whether red green color blindness is recessive, dominant or co-dominant.
2.To answer this question, think of skin color: Is everyone either black or white, or do you know people with various shades of skin color?
3. Don't be confused by the term "concordance."It just means the degree to which they both have a certain trait. So, if identical twins, who share a set of genes, both have a certain trait much more often than fraternal twins who only share about half of their genes, what does that say about the characteristic?Is it encoded genetically or not?
4. To answer this question, in your textbook, look up how many genes humans normally have.Then look up the definitions of the answer choices.
5.Just read about telomeres.It is probably only 1 paragraph in your textbook.
6.Just read about Down's syndrome.It is probably only a column or 2 in your textbook.
7.Probably in your textbook also.
8.To answer this, think about what process telomeres are involved in.What if you were playing a part in a play about the process in which telomeres are involved and you had to play your roll by latching onto a telomere and your telomere wasn't there.As you are pulled off the stage, what happens to the chromosome to which you were supposed to attach via the telomere?What doesn't happen to it?
9.To answer this question, you should know that males are much more likely to be red-green color blind than girls.So what does a Turner's syndrome girl have in common with a male who is red-green color blind?
10. You will know the answer to this after you have answered questions 4 & 6.
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