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SCI 230 Week 2 DQ 1

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SCI 230 Week 4 Day 5 Assignment: CheckPoint
Mendel’s approach to answering scientific questions differed from his contemporaries in a
couple of ways. First, he chose to focus on just a few traits for his studies instead of several
different ones. Second, he incorporated mathematics into his analysis. This was something which
was uncommon in plant breeding in Mendel’s day.
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 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 Mendel’s 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.
References
http://higheredbcs.wiley.com/legacy/college/pruitt/0471473219/bioinquiries/ch03/bioinquiry.htm

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