Tuesday, February 8, 2011

Answers for Study guide!

1.       Give an example of a Homozygous Dominant, Homozygous Recessive and Heterozygous genotype.
 Homozygous Dominant = TT
 Heterozygous = Tt
 Homozygous resessive = tt

2.       What is a phenotype?
 It is the physical characteristic. What does the trait look like?
TT = Tall ;Tt = Tall; tt = Short

3.       Why did Mendel use Pea plants?
Easy to grow, create lots of offspring, can make pure traits, can control cross fertilization


4.       What were the parent and offspring genotypes and phenotypes in Mendel’s P1 cross?

 TTxtt         Genotypes = All Tt         Phenotype = All Tall
                  G. Ratio = All Alike           P Ratio = All alike

5.       What were the parent and offspring genotypes and phenotypes in Mendel’s F1 cross?
              TtxTt                     Genotypes = TT, Tt, tt                   Phenotypes = Tall; short
                                            G. Ratio = 1:2:1                            P. Ratio = 3:1
6.       What is the Law of Dominance?
 In a cross of pure contrasting traits all offspring will have heterozygous genotyoe and all take the dominant trait!

7.       What is the Law of Segregation?
          Alleles seperate in the formation of Gametes (sex cells) (sperm and egg) and then recombine during fertilization.

8.       What is the law of Independent assortment? And what kind of cross will show this?
 Alleles for different traits will seperate independently from one another. tall doesn't follow wrinkled seeds and short doesnt follow round seeds and so forth. You can see this in a Dihybrid cross

9.       How does Meiosis increase Genetic variability? And name where it happens.
1) Crossing over = Prophase 1
2)Independent assortment = Metaphase 1
3) Random fertilization = when the sperm fertilizes the egg
 

10) answers for pictures

1. Anaphase 1
2. Anaphase 2
3. Prophase 1
4. Metaphase 1
5. Metaphase 2
6. Telophase 1
7. Prophase 2
8. Telophase 2/ cytokinesis  This is the end product!

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8 comments:

  1. Rebecca St. CroixFebruary 9, 2011 at 8:26 AM

    Thanks a lot Mr. O'Leary! I would have never known the answers without you;p

    ReplyDelete
  2. AnonymousFebruary 9, 2011 at 11:50 AM

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    ReplyDelete
  3. Justin Beautiful BradleyFebruary 9, 2011 at 12:46 PM

    You are one swell man for posting the answers here. Thank you so much.

    ReplyDelete
  4. Sierra ReardonFebruary 9, 2011 at 7:44 PM

    haha wow you guys are crazzzy! especially you rebecca lol :)

    ReplyDelete
  5. AnonymousFebruary 10, 2011 at 10:32 PM

    Thank You Mr.O'Leary
    Thank You Thank You
    I completed my study guide because I was on this blog and I did pretty good

    Thank you so much

    ReplyDelete
  6. AnonymousFebruary 10, 2011 at 10:34 PM

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    ReplyDelete
  7. AnonymousFebruary 11, 2011 at 10:05 AM

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    ReplyDelete
  8. AnonymousFebruary 28, 2011 at 8:35 PM

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    ReplyDelete

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