Patterns of inheritance

Last update by Claudia on 09/04/2012
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What was Mendel's first hypotheses?

There are alternative versions of genes, the units that determine heritable traits. For example, the gene for flower colour in pea plants exists in one form for purple and another for white. The alternative versions of genes are called alleles.

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  • Claudia Conaglen
    What was Mendel's second hypotheses?
    For each inherited character, an organism inherits two alleles, one from each parent. They may be the same or different.
  • Claudia Conaglen
    What is an organism called with two identical alleles for a gene?
  • Claudia Conaglen
    What is an organism called with two different alleles for a gene called?
  • Claudia Conaglen
    What was Mendel's third hypotheses?
    If the two alleles of an inherited pair differ, then one determines the organism's appearance and is called the dominant allele; the other has no noticeable effect on the organism's appearance and is called the recessive allele.
  • Claudia Conaglen
    What was Mendel's fourth hypotheses?
    A sperm or egg carries only one allele for each inherited character because the two members of an allele pair segregate from each other during the production of gametes. This statement is now known as the law of segregation. When egg and sperm unite at fertilization, each contributes its alleles, restoring the paired condition in the offspring.
  • Claudia Conaglen
    What is independent assortment?
    Independent assortment is the random assortment of chromosomes during the production of gametes, the results are genetically unique individual gametes.

    In a lot of, if not most cases a person has 2 copies of a gene in their cells. When your body makes gametes (egg or sperm) the gamete only gets 1 copy of the gene. The law of independent assortment is saying that whichever copy of that gene goes into the gamete is random, and also that the genes for 2 different traits (say... height and eye color) are inherited independently of each-other. I.E. not all short people have brown hair, and not all freakishly tall people blue eyes. This law is always true unless the genes are linked, which basically means that they're located very close together on the same chromosome, and they are almost always inherited together. An example being that red haired people generally have a very fair complexion.

  • Claudia Conaglen
    What is the law of segregation?
    the principle, originated by Gregor Mendel, stating that during the production of gametes the two copies of each hereditary factor segregate so that offspring acquire one factor from each parent.
Patterns of inheritance
Patterns of inheritance
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