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Is this phrase true or false? "An allele can be defined as a variation in the n…

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Wize University Biology Textbook > Mendelian Genetics

Genotype and Phenotype

2 Activities

Is this phrase true or false?
"An allele can be defined as a variation in the nucleotide sequence of the genes that always result in an observable phenotype"
More Genotype and Phenotype Questions:
Inheritance of traits practice problem 3
In cats, big ears are dominant over short ears, and the gene is autosomal. Another gene controls eye colour, and is X-linked. "E" gives brown eyes, "e" gives blue eyes, and Ee gives green eyes.
Brown eyed male with the homozygous genotype for big ears is mated with a female with short ears and green eyes. What kittens could be produced?
Note: X-linked traits are on the X chromosome. Females have two X chromosomes while males have one X chromosome and one Y chromosome.
The bacterium Mycobacterium tuberculosis is capable of degrading
cholesterol due to the presence of a cluster of genes encoding cholesterol-degrading enzymes. In the lab, you removed the gene that encodes the cholesterol transport and the bacterium is no longer able to bring cholesterol in to the cell. The inability of the bacterium to grow on cholesterol is a change to the ________________, while the removal of the gene is a change to the __________________.
Which of the following described alleles?
Genome
A diploid cell that is 2n = 4 receives a2, b2, and c2 alleles from one parent, and a1, b2, and c2 alleles from the other parent. Alleles a and b are on the same chromosome, while allele c is on another one.
Draw the resulting cell after DNA replication.
Genome
A cell has a genotype a1/a2, c3/c3. Draw the cell before and after DNA replication.
Inheritance of traits practice problem 3
In cats, big ears are dominant over short ears, and the gene is autosomal. Another gene controls eye colour, and is X-linked. "E" gives brown eyes, "e" gives blue eyes, and Ee gives green eyes.
Brown eyed male with the homozygous genotype for big ears is mated with a female with short ears and green eyes. What kittens could be produced?
Note: X-linked traits are on the X chromosome. Females have two X chromosomes while males have one X chromosome and one Y chromosome.
Cell cycle practice problem 2
A cell is 2n=82n=8and has the genotype a2/a2, b1/b2, c1/c2, d2/d2. Draw the cell:
a) in "G1 phase"
b) At "metaphase"
An individual's complete set of alleles makes up their:
Assume the following dihybrid crosses where for a particular gene, A represents the dominant allele and a, the recessive allele, and for another trait, B represents the dominant allele and b, the recessive allele. Genes show complete dominance.
Which of the following described alleles?
Which of the following describes alleles?
Which of the following statements is false?
Practice: Alleles
Which of the following describes alleles?
Practice: Bacterium
The bacterium Staphylococcus aureus is able to produce a compound called staphyloferrin B. In the lab, you removed the gene that encodes the enzymes responsible for producing this compound. The inability of the bacterium to produce staphyloferrin is a change to the ________________, while the removal of the gene is a change to the __________________.
Which of the following described alleles?