Allele

dominance, or codominance? Why does the mother have freckles, even though she has a gene for no freckles? Why does the father have no freckles? | Freckles in humans are a dominant recessive pattern. A parent carrying even a single copy of the dominant allele F will have freckles, in this case it is mom. The dad who has homozygous recessive ff has no freckles. | Exercise 3: Blood Type A male has Type A blood, and a female has Type B blood. Could they have a child with Type O blood?…

the kitten’s two alleles comes from the father and the other comes from the mother. There are two possible alleles for that gene, a dominant one and a recessive one. The kitten’s physical appearance is known as their phenotype, and whatever alleles the kitten has is known as their genotype. If the kitten’s genotype is two dominant alleles, then that’s what their phenotype will be. This is known as having a homozygous genotype. If a kitten’s genotype is the the two recessive alleles, then that is…

Introduction Drosophila melanogaster can be considered model organisms for the study of genetics. Some characteristics that contribute to this status are their quick lifecycles, large amount of offspring, and the presence of only four chromosomes. Drosophila melanogaster contain bristles on the thorax, head, legs, and abdomen. These bristles are used as a sensory mechanism, allowing fruit flies to detect their surroundings as they fly and walk around their environment (Yehuda, 2011). The rate…

Confirmation of Mendel’s Law of Segregation I. In Biology class the past few weeks we have been learning about Gregor Mendel. Gregor Mendel is often called the father of modern genetics. Mendel developed the theory of inheritance several decades before the observance of chromosomes via microscope. In Biology lab the past two weeks I completed a series of tests using fast plants, Brassica rapa. The objective of this experiment was to study the Mendelian laws of genetics as they applied to…

picking up the cards more difficult. If the paper bags were to replaced with another medium, such as a box with a wider opening, then the simulation would run more smoothly. In addition, the size of the paper bag also causes the process of shaking the alleles to be less randomized. With the limited space, the laminated cards cannot shuffle well, except moving up and down, making the experiment to be less randomized. Even with another medium, the act of shaking is not efficient enough to fully…

that recessive alleles cause offspring to differ from their parents is shown an experiment conducted by Gregor Mendel. In this experiment, Mendel crossed a purebred tall plant with a purebred short plant. The resulting offspring, or the first filial generation, was entirely tall. The first filial generation was allowed to self-pollinate, and the second filial generation, to Mendel’s surprise was approximately one-fourth short and three-fourths tall. Another way that recessive alleles can cause…

Cystic Fibrosis What is Cystic Fibrosis? Cystic Fibrosis is a genetic disease that is one of the most common and lethal. The disease is usually noticeable in the victim by the age of 3 and impairs their ability to breathe and digest normally. This genetic disease is caused by a mutation of the CFTR gene (cystic fibrosis transmembrane conductance regulator). Everyone does have this gene, but only when it is mutated can it cause Cystic Fibrosis. Normally, the CFTR gene produces a protein whose job…

and Law of Dominance (Orel, 1996). The Law of Segregation states two alleles for a heritable character separate from each other during gamete formation and end up in different gametes (Reese et al., 2013). Law of Independent Assortment states that each pair of alleles separates independently of each other pair of alleles during gamete formation (Reese et al., 2013). Mendel’s last law, Law of Dominance, states that recessive alleles…

mouse passes a dominant allele, the offspring will have black fur.” Having this hypothesis allows us to begin the experiment and come to the conclusion as to whether or not the results will either support or refute the hypothesis. For the first part of the experiment students are to predict and confirm the offspring of two mice homozygous for black fur. Now, in order to proceed identifying an unfamiliar term is key. Homozygous refers to having the same or identical alleles. With this in mind,…

the parent’s genetic information . Cells have two copies of genetic information stored in theirevery chromosomes. Each chromo carries one copy of each gene. Chromosomes that make up the allele can be the same or differ from each other . Alleles that have two copies of the same trait are homozygous. If the alleles differ the cell will express the dominant trait phenotypically, but could pass on a different trait to its offspring due to half of its sex cells carrying the recessive gene. This…