week 4 checkpoint - trait may be either the same or the can...

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Mendel took a different approach because he really focused on a small number of traits as opposed to trying to figure it all out at once. He incorporated mathematics into his analysis. By using mathematics Mendel determined that each factor or trait occurred in pairs. During reproduction offspring receive one part of a factor or trait from each parent. This means one part coming from its mother and one part coming from its father to form the pair. The parts which make up these pairs are called alleles. This pairing of factors or traits led him to realize that there were dominate and recessive traits. Mendel gained some advantages in choosing the pea plant for his studies. The pea plant is easily manipulated in breeding experiments and there are several distinct strains and verities available. Some of the conclusions Mendel hypothesized from his work with traits are: 1. Each of us carries two alleles for each gene we possess. These two alleles which make up each
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Unformatted text preview: trait may be either the same or the can both be different from each other. If they are the same they are called homozygous and if they are different they are called heterozygous. 2. Some genes are dominate and this can cause heterozygous individuals to express only one allele, the dominate one while showing no signs of the recessive allele. This can cause the phenotype to not always reveal the genotype of an individual. This means that an individual can carry an allele or trait and not show it. 3. Using Mendels law of segregation, the offspring of two heterozygous parents can end up with any combination of alleles. When the gametes combine at fertilization they do not care which alleles they carry. The alleles a person inherits are strictly by chance so the rules of probability can be used to which pairings a person might have. The Punnett square is used illustrate this law....
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