AP-Bio-HW-14-091113 (2)

AP-Bio-HW-14-091113 (2) - Homework #14 (091113): Chapter 14...

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Homework #14 (091113): Chapter 14 (due Friday 091113 ) Total points: 20 for Attempt on all questions ONE Concept Map: 10 points Objectives Gregor Mendel’s Discoveries 1. Explain how Mendel’s particulate mechanism differed from the blending theory of inheritance. - Particulate Mechanism o This theory states that parents pass on discrete heritable units (genes) ,that retain their separate identities, to their off spring. These heritable units ( genes) can then be passed along generation to generation. This also means that an organism’s genetic makeup is a combination of certain unchanging ( mostly , except for mutations & the like) ‘particles’, hence the theories name. - Blending Theory of inheritance o This basically states that genes from the two parents mix like two colors mix to make a new color. This hypothesis also states that over many generations a freely mating population will give rise to a uniform population of individuals. This hypothesis has been proven false 2. Define the following terms: true-breeding, hybridization, monohybrid cross, P generation, F 1 generation, and F 2 generation. - True-breeding o These organisms, when they self pollinate create organisms that are of the same variety. - Hybridization o The mating/crossbreeding of two true breeding parents. - Monohybrid cross o The cross between organisms heterozygous for a particular characteristic. - P generation o The true breeding parents involved in the cross. - F 1 generation o The first generation or organisms resulting from the cross breeding of the P generation. - F 2 generation o The organisms resulting from the self pollination of the F 1 generation 3. List and explain the four components of Mendel’s hypothesis that led him to deduce the law of segregation. 3.1. - Alternate version of genes account for variation in inherited characteristics - These alternative versions of genes are called alleles. The alternate versions of genes are due to DNA differences, 3.2. - For each character an organism inherits two alleles - Each allele represents a particular form of a trait. Both alleles are located at a specific location on the genes (the locus) – Mendel didn’t know this. 3.3. - If two alleles at a locus differ the one, the dominant allele, determines the organisms appearance; the other, the recessive allele, has no noticeable effect on the organism’s appearance . - For example Medel’s F 1 plants had purple flowers because that allele is dominant and the white color for flowers is recessive. 3.4. - The two alleles for a heritable character separate (segregate) during gamete formation and end up
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in different gametes. - This means that each gamete gets one of two alleles for a particular trait. This means that the offspring can exhibit trait not found in either parent if both parents are heterogeneous and the offspring inherit both recessive alleles. 4.
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AP-Bio-HW-14-091113 (2) - Homework #14 (091113): Chapter 14...

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