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    cystic fibrosis is a genetic disorder. it is a recessive trait that is determined by two alleles. suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. which statement reflects the likelihood of a child of these parents having cystic fibrosis? the child cannot have the disease because only the dominant alleles will be passed on. the child will have the disease because only recessive alleles will be passed on. the child may or may not have the disease because a recessive gene from each parent may be passed on. the child may or may not have the disease because the disease does not depend on the alleles of the parents.

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    get cystic fibrosis is a genetic disorder. it is a recessive trait that is determined by two alleles. suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. which statement reflects the likelihood of a child of these parents having cystic fibrosis? the child cannot have the disease because only the dominant alleles will be passed on. the child will have the disease because only recessive alleles will be passed on. the child may or may not have the disease because a recessive gene from each parent may be passed on. the child may or may not have the disease because the disease does not depend on the alleles of the parents. from EN Bilgi.

    Biology Semester 2 Flashcards

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    The diagram represents meiosis.

    Which of Mendel's laws or principles of inheritance can be explained by the diagram?

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    segregation

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    The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.

    What is the phenotypic ratio of the offspring?

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    1:3:3:9

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    1/14 Created by Amy_Cox12

    Terms in this set (14)

    The diagram represents meiosis.

    Which of Mendel's laws or principles of inheritance can be explained by the diagram?

    segregation

    The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.

    What is the phenotypic ratio of the offspring?

    1:3:3:9

    The pedigree traces red-green color blindness.

    Which family members have red-green color blindness?

    Sam, Tim, Bella, and Joshua

    If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?

    P generation and F2 generation

    Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

    The child may or may not have the disease because a recessive gene from each parent may be passed on.

    Mendel's pea plants had either purple or white flowers. This means that the plants

    have two alleles for the gene.

    A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds?

    Key: R = round r = wrinkled Y = yellow y = green 1:16

    Red-green color blindness is an X-linked recessive disorder.

    What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?

    25%

    Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree.

    Who has hemophilia in the pedigree that is shown?

    Fred and Luke

    Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome.

    If Brian has a son who is color-blind, what is known about the genotype of the son's mother?

    She must have at least one allele for color blindness.

    Which are different forms of the same gene?

    alleles

    Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. Which Punnett square represents the correct way to set up the cross RRYy ´ RrYY?

    http://media.education2020.com/evresources/3209-06-02/mc012-3.jpg

    Mendel was able to study seven traits in all the pea plants in each generation. Which of his hypotheses allowed him to analyze each trait separately?

    When gametes are formed, each gamete carries only one allele for the gene.

    The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

    https://media.edgenuity.com/evresources/3209-06-02/mc008-2.jpg

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    CF Genetics: The Basics

    Every person has two copies of the cystic fibrosis transmembrane conductance regulator (CFTR) gene. A person must inherit two copies of the CFTR gene that contain mutations -- one copy from each parent -- to have cystic fibrosis.

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    Jump back to top

    Source : www.cff.org

    What are the different ways a genetic condition can be inherited?: MedlinePlus Genetics

    Conditions caused by genetic variants (mutations) are usually passed down to the next generation in certain ways. Learn more about these patterns.

    What are the different ways a genetic condition can be inherited?

    Some genetic conditions are caused by variants (also known as mutations) in a single gene. These conditions are usually inherited in one of several patterns, depending on the gene involved:

    Patterns of inheritance

    Inheritance pattern Description Examples Autosomal dominant

    One altered copy of the gene in each cell is sufficient for a person to be affected by an autosomal dominant disorder. In some cases, an affected person inherits the condition from an affected parent. In others, the condition may result from a new variant in the gene and occur in people with no history of the disorder in their family.

    Huntington disease, Marfan syndrome

    Autosomal recessive

    In autosomal recessive inheritance, variants occur in both copies of the gene in each cell. The parents of an individual with an autosomal recessive condition each carry one copy of the altered gene, but they typically do not show signs and symptoms of the condition. Autosomal recessive disorders are typically not seen in every generation of an affected family.

    cystic fibrosis, sickle cell disease

    X-linked dominant

    X-linked dominant disorders are caused by variants in genes on the X chromosome. In males (who have only one X chromosome), a variant in the only copy of the gene in each cell causes the disorder. In females (who have two X chromosomes), a variant in one of the two copies of the gene in each cell is sufficient to cause the disorder. Females may experience less severe symptoms of the disorder than males. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons (no male-to-male transmission).

    fragile X syndrome X-linked recessive

    X-linked recessive disorders are also caused by variants in genes on the X chromosome. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), a variant would have to occur in both copies of the gene to cause the disorder. Because it is unlikely that females will have two altered copies of this gene, males are affected by X-linked recessive disorders much more frequently than females. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons (no male-to-male transmission).

    hemophilia, Fabry disease

    X-linked

    Because the inheritance pattern of many X-linked disorders is not clearly dominant or recessive, some experts suggest that conditions be considered X-linked rather than X-linked dominant or X-linked recessive. X-linked disorders are caused by variants in genes on the X chromosome, one of the two sex chromosomes in each cell. In males (who have only one X chromosome), an alteration in the only copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), one altered copy of the gene usually leads to less severe health problems than those in affected males, or it may cause no signs or symptoms at all. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons (no male-to-male transmission).

    glucose-6-phosphate-dehydrogenase-deficiency, X-linked thrombocytopenia

    Y-linked

    A condition is considered Y-linked if the altered gene that causes the disorder is located on the Y chromosome, one of the two sex chromosomes in each of a male's cells. Because only males have a Y chromosome, in Y-linked inheritance, a variant can only be passed from father to son.

    Y chromosome infertility, some cases of Swyer syndrome

    Codominant

    In codominant inheritance, two different versions (alleles) of a gene are expressed, and each version makes a slightly different protein. Both alleles influence the genetic trait or determine the characteristics of the genetic condition.

    ABO blood group, alpha-1 antitrypsin deficiency

    Mitochondrial

    Mitochondrial inheritance, also known as maternal inheritance, applies to genes in mitochondrial DNA. Mitochondria, which are structures in each cell that convert molecules into energy, each contain a small amount of DNA. Because only egg cells contribute mitochondria to the developing embryo, only females can pass on mitochondrial variants to their children. Conditions resulting from variants in mitochondrial DNA can appear in every generation of a family and can affect both males and females, but fathers do not pass these disorders to their daughters or sons.

    Leber hereditary optic neuropathy (LHON)

    Many health conditions are caused by the combined effects of multiple genes (described as polygenic) or by interactions between genes and the environment. Such disorders usually do not follow the patterns of inheritance listed above. Examples of conditions caused by variants in multiple genes or gene/environment interactions include heart disease, type 2 diabetes, schizophrenia, and certain types of cancer. For more information, please see What are complex or multifactorial disorders?

    Disorders caused by changes in the number or structure of chromosomes also do not follow the straightforward patterns of inheritance listed above. To read about how chromosomal conditions occur, please see Are chromosomal disorders inherited?

    Other genetic factors sometimes influence how a disorder is inherited. For an example, please see What are genomic imprinting and uniparental disomy?

    Source : medlineplus.gov

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