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Camponeschi

Camponeschi - genetics targets 2a, 2b, 2c

QuestionAnswer
homozygous having 2 of the same alleles for one gene
allele the different versions of one gene/trait
phenotype trait that shows
dominant gene that is a blueprint for a functioning protein - if have one dominant gene, trait shows
heterozygous having 2 different alleles for one gene/trait
genotype actual genes that a person has (the combination of alleles for one gene)
gene blueprint for a specific protein
recessive a blueprint for a protein that doesn't work - you see the "absence" of the dominant trait - which is the recessive trait
True or False - more than one gene is located on one chromosome true
True or False - the same gene can be located on two different chromosomes. For example, the gene for having hair on your fingers can be located on chromosome 12 and also on chromosome 5. false - one specific gene is shown on one specific chromosome; however, more than one gene can control a specific trait and these genes can be on different chromosomes - example is eye color. 3 genes control eye color and are seen on 3 dif. chromosomes.
If an organism heterozygous for a trait, will they show a dominant phenotype or recessive phenotype? dominant phenotype
If an organism shows a dominant phenotype, can you determine if that organism is homozygous or heterozygous by simply looking at the phenotype no. the organism might be homozygous or heterozygous for that trait.
can an organism be heterozygous for a given trait and show the recessive phenotype for that trait? no - if an organism is heterozygous for a given trait, it will show the dominant phenotype because it has at least one dominant gene
What information does a Punnett Square give? all the possible genotypes of a genetic cross and the probability of each genotype.
On a Punnett Square, what is shown on the top and along the side? The sex cells of the parents (the genes each parent could give the offspring)
On a Punnett Square, what is shown inside the boxes? The possible genotypes of the offspring.
From the information below, what is an example of a genotype? W = widow's peak (dominant gene) w = no widow's peak Ww - this is a genotype because it shows the combination of two genes
From the information below, what is an example of a phenotype? W = widow's peak (dominant gene) w = no widow's peak no widow's peak - this is a phenotype because it describes the physical appearance of a trait
From the information below, what is an example of an allele? W = widow's peak (dominant gene) w = no widow's peak W or w - these are each alleles because they are each a version of the widow's peak gene.
From the information below, which is a blueprint for a functional protein? W = widow's peak (dominant gene) w = no widow's peak W - the gene for a widow's peak because it is a dominant gene.
Using the information below, what percent of the offspring would have a widow's peak from the cross: WW x ww? W = widow's peak (dominant gene) w = no widow's peak 100% of the children would have a widow's peak.
How many copies of each gene do you have? Two. - one copy from mom and one copy from dad.
Created by: camponel
 

 
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