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23_Lecture_Presentation_PC
23_Lecture_Presentation_PC

... • Duplication of small pieces of DNA increases genome size and is usually less harmful • Duplicated genes can take on new functions by further mutation • An ancestral odor-detecting gene has been duplicated many times: humans have 1,000 copies of the gene, mice have 1,300 ...
Name:___________________________     Date: ____________Period:_____
Name:___________________________ Date: ____________Period:_____

... 1. A man with a certain syndrome marries a woman who is normal for that trait. They have 6 children, three girls and three boys. All of the girls have the same syndrome as the father whereas none of the boys is affected. Which type of heredity is not possible here? 2. Given that the dominance hierar ...
Chapter 11:
Chapter 11:

... • 1.) The inheritance of biological characteristics is determined by individual units known as genes. In organisms that reproduce sexually, genes are passed from parents to their offspring. • 2.) In cases in which 2 or more forms of the gene for a single trait exist, some forms of the gene may be do ...
E-Halliburton chapter 6
E-Halliburton chapter 6

... coefficients and population sizes play roles for the efficiency of this. In very small populations genetic drift can override selection, and more often lead to fixation of harmful mutant alleles. ”Silent”, or synonymous mutations in a codon (3rd codon position) do not change the resultant amino acid ...
genetic diversity and diversity of environment: mathematical aspects
genetic diversity and diversity of environment: mathematical aspects

... and the adaptive values in the kth niche are Wk and 1. There will be a stable equilibrium if E, ck Wk > 1 and ckl/Wk > 1, or in other words if T > 1 and Wh < 1, where I is the mean of the Wk weighted by the niche sizes Ck but not by the q and Wh is the correspondingly weighted harmonic mean of the W ...
Importance of Genetic Studies in Consanguineous Populations for
Importance of Genetic Studies in Consanguineous Populations for

... half of these are caused by autosomal dominant mutations (thus causing autosomal dominant disorders), and the rest are autosomal recessive or X-linked. Thus, given the estimation of 20,000 genes in the human genome, we have not observed the homozygous effects of mutations causing LoF for over 10,00 ...
The Genetics of Horse Coat Color
The Genetics of Horse Coat Color

... White  coats  have  long  been  a  desirable  color   for  their  beauty,  but  are  also  more  rare   among  horses.  Why?  White  coats  present   another  different  but  interesting  mechanism   of  genetic  inheritance.  More  often ...
Chapter_9_HB_Patterns_of_Inheritance
Chapter_9_HB_Patterns_of_Inheritance

... • Genetics is the science of heredity • A common genetic background will produce offspring with similar physical and behavioral traits – Purebred dogs show less variation than mutts – True-breeding individuals are useful in genetic research • Behavioral characteristics are also influenced by environ ...
Dominant/Recessive
Dominant/Recessive

... separate piece of DNA, so a cell with eight chromosomes has eight long pieces of DNA. A gene is a segment of the long DNA molecule. Different genes may be different lengths. Each gene is a code for how a certain molecule can be made. The molecules produced by the genes can generally be sorted into ...
© NCERT not to be republished
© NCERT not to be republished

... Principle: When two pure lines with contrasting forms of a particular character (phenotypes) are crossed to produce the next generation (F1 generation), all the members of the progeny are of only one phenotype i.e. of one of the two parents. The phenotype that appears is called dominant, and the one ...
Genetics Protocol
Genetics Protocol

... We all know that children tend to resemble their parents in appearance. Parents and children generally have similar eye color, hair texture, height and other characteristics because children inherit genes that control specific characteristics from their parents. Where are genes found in our bodies? ...
Punnett Squares – Monohybrid, Dihybrid and Sex
Punnett Squares – Monohybrid, Dihybrid and Sex

... XY. Certain genes located on the X chromosome, not associated with female sex characteristics, cause sex-linked recessive traits. As a result, females must receive two recessive alleles to exhibit any particular characteristic associated with one of these genes, while males need only receive one all ...
Problems in Mendelian Genetics
Problems in Mendelian Genetics

... All offspring always produce white flowers. In some matings, all offspring produce red flowers. In other matings, some of the offspring produce red flowers, some white, with red flowering offspring outnumbering white flowering offspring. In some matings, all offspring produce blue flowers.. In other ...
Ch 10 test 04-05
Ch 10 test 04-05

... _____ 5. Which genetic principle states that genes are distributed to gametes in a random fashion? a. mutation b. dominance c. independent assortment d. segregation _____ 6. The appearance of a recessive trait in offspring of animals most probably indicates: a. one parent was homozygous dominant and ...
Problems in Mendelian Genetics
Problems in Mendelian Genetics

... All offspring always produce white flowers. In some matings, all offspring produce red flowers. In other matings, some of the offspring produce red flowers, some white, with red flowering offspring outnumbering white flowering offspring. In some matings, all offspring produce blue flowers.. In other ...
Slide 1
Slide 1

... 9.16 Chromosome behavior accounts for Mendel’s laws  Mendel’s Laws correlate with chromosome separation in meiosis – The law of segregation depends on separation of homologous chromosomes in anaphase I – The law of independent assortment depends on alternative orientations of chromosomes in ...
Problems in Mendelian Genetics
Problems in Mendelian Genetics

... All offspring always produce white flowers. In some matings, all offspring produce red flowers. In other matings, some of the offspring produce red flowers, some white, with red flowering offspring outnumbering white flowering offspring. In some matings, all offspring produce blue flowers.. In other ...
handout
handout

... The combination of selection and drift is difficult to model theoretically. The required mathematics will soon venture outside the depth of knowledge you are required to have for this course, so we will not be able to show much derivation. You will be responsible for knowing the main findings and im ...
Document
Document

... Organisms pass their genes from parent to offspring via the cells that are produced from a type of cell division called meiosis. In humans, meiosis occurs in the ovaries in females and the testis in male, producing eggs and sperm. Cells produced in meiosis are called gametes and contain ½ the number ...
The genetic diversity of Myrciaria floribunda
The genetic diversity of Myrciaria floribunda

... about 10 km2 . It was conducted in fragments of Atlantic Forest that occur in high altitude (montane forest), located in Southern Minas Gerais State. Myrciaria floribunda (West ex Willdenow) Berg is a common tree species of the Atlantic Forest (Sobral 1993). It may occur in wet forest of Central and ...
Welcome! 3/12/14
Welcome! 3/12/14

... Review the key for making pedigrees... Draw the pedigree for this family on a piece of chart paper. DRAW IN PENCIL FIRST. You may also want to make a rough draft on a piece of scratch paper.   4.  Read the following description and color in the squares or circles for the affected individuals.   5.  ...
Document
Document

... • Duplication of small pieces of DNA increases genome size and is usually less harmful • Duplicated genes can take on new functions by further mutation • An ancestral odor-detecting gene has been duplicated many times: humans have 1,000 copies of the gene, mice have 1,300 ...
Probability and Punnett Squares
Probability and Punnett Squares

... determined by drawing a diagram known as a Punnett square. ! Punnett ...
Unit 2
Unit 2

... heterozygous parents) with the predictions from the Punnett Square shown on Page 2. Are the fractions of each genotype in these children similar to the predicted fractions? If there is any difference between your results and the predictions, is this difference relatively small or large? To compare y ...
! Genetic Variation Within Populations
! Genetic Variation Within Populations

... A phenotype is a trait produced by one or more genes. In a population, there may be a wide range of phenotypes. For example, some penguins may be short and rounded. Others could be tall and slim. Natural selection acts on different phenotypes in a population. The expression of different phenotypes ...
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Inbreeding

Inbreeding is the sexual reproduction of offspring from the mating or breeding of individuals or organisms that are closely related genetically. By analogy, the term is used in human reproduction, but more commonly refers to the genetic disorders and other consequences that may arise from incestuous sexual relationships and consanguinity.Inbreeding results in homozygosity, which can increase the chances of offspring being affected by recessive or deleterious traits. This generally leads to a decreased biological fitness of a population (called inbreeding depression), which is its ability to survive and reproduce. An individual who inherits such deleterious traits is referred to as inbred. The avoidance of such deleterious recessive alleles caused by inbreeding, via inbreeding avoidance mechanisms, is the main selective reason for outcrossing. Crossbreeding between populations also often has positive effects on fitness-related traits.Inbreeding is a technique used in selective breeding. In livestock breeding, breeders may use inbreeding when, for example, trying to establish a new and desirable trait in the stock, but will need to watch for undesirable characteristics in offspring, which can then be eliminated through further selective breeding or culling. Inbreeding is used to reveal deleterious recessive alleles, which can then be eliminated through assortative breeding or through culling. In plant breeding, inbred lines are used as stocks for the creation of hybrid lines to make use of the effects of heterosis. Inbreeding in plants also occurs naturally in the form of self-pollination.
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