knowverseGenotype and phenotype describe the genetic composition and the observable traits of an organism. The quiz covers alleles, homozygous and heterozygous genotypes, dominant and recessive traits, meiosis, DNA structure, replication, transcription, translation, codons, and mutations. Try the questions to see how well you know these concepts.
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The reappearance of the white flower trait proved that the underlying factor remained intact rather than blending away.
The white color would actually reappear in the next generation, proving it was just 'hidden' rather than destroyed.
From the Knowverse course text.
Alleles are different variations of the same gene, such as those determining different eye colors or blood types.
Alleles are alternative versions of the same gene that produce variations in a physical trait.
From the Knowverse course text.
Phenotype refers to observable physical characteristics, whereas genotype is the specific genetic composition.
The word for these observable, physical characteristics of an organism is the phenotype.
From the Knowverse course text.
An organism with two identical alleles for a trait is homozygous for that gene.
When an organism inherits two identical alleles for a particular gene, it is called homozygous.
From the Knowverse course text.
Meiosis reduces chromosome counts from 46 to 23 in human reproductive cells, ensuring that fertilization yields the correct 46.
Because of meiosis, each sperm or egg cell contains only 23 chromosomes instead of the usual 46.
From the Knowverse course text.
The repeating sugar and phosphate molecules form the outer backbone that stabilizes the double helix.
Each of the two strands in the helix has a sturdy outer frame called the sugar-phosphate backbone.
From the Knowverse course text.
Semi-conservative replication preserves one original template strand in each newly created double-stranded molecule.
This is called semi-conservative replication, because half of the original molecule is 'conserved' in each of the two new copies.
From the Knowverse course text.
During transcription, the cell reads a section of nuclear DNA to synthesize a complementary mRNA copy.
During this stage, the cell does not change the original DNA; it simply reads the sequence to create a strand of RNA.
From the Knowverse course text.
A codon consists of a three-base sequence that specifies a particular amino acid during translation.
To solve this, the cell reads the genetic sequence in groups of three bases, known as a codon.
From the Knowverse course text.
Mutations generate new sequences, providing the raw genetic diversity needed for adaptation and evolution.
Mutations are the ultimate source of all new genes in the natural world.
From the Knowverse course text.
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Gregor Mendel demonstrated that physical traits depend on discrete factors that remain distinct across generations. Instead of blending together like paint, inherited instructions separate and recombine. Organisms inherit two alleles for each gene, one from each parent, occupying a fixed position on a chromosome known as a locus.
An organism with two identical alleles for a specific gene has a homozygous genotype, while differing alleles form a heterozygous genotype. The observable traits resulting from this genetic pairing make up the phenotype. Dominant alleles can mask recessive ones, allowing traits to disappear in one generation and reappear unchanged in the next.
Mendel concluded that inheritance is controlled by discrete units that do not mix or change.
From the Knowverse course text.
DNA carries genetic instructions in a double helix stabilized by an outer sugar-phosphate backbone. Inward-facing nitrogenous bases follow strict complementary pairing rules: adenine binds with thymine, and guanine binds with cytosine. When cells divide, each strand acts as a template for a new partner in semi-conservative replication.
Gene expression converts these digital sequences into functioning proteins through transcription and translation. Inside the nucleus, a DNA sequence is copied into single-stranded messenger RNA. Ribosomes then read the mRNA in three-base codons, assembling specific amino acids into polypeptide chains that fold into functional proteins.
Scientists call this overall journey from genetic code to a functional product gene expression.
From the Knowverse course text.
Sources: Genetics and Information. Each question or step includes an excerpt from the course.
