Science Quiz

Chromosome

A thread-like structure of DNA located in the nucleus that carries genetic information in the form of genes.

Gene

A distinct segment of DNA that codes for the production of a specific protein.

Allele

An alternative form or variation of a specific gene.

Mutation

A permanent change in a DNA sequence that can alter protein structure and function.

Genotype

The specific combination of alleles that an organism inherits for a trait.

Phenotype

The observable physical traits or characteristics displayed by an organism.

Heterozygous

Having two different alleles for a given gene, such as $Aa$, $Rr$, or $Qq$.

Homozygous

Having two identical alleles for a given gene, such as $AA$, $FF$, or $bb$.

Mechanism by which chromosomes pass from parents to offspring

They are inherited through sexual reproduction via sex cells (sperm and egg).

Outcome when myostatin protein successfully fits into its cell receptor

Normal muscle regulation occurs, leading to typical muscle development.

Outcome when a mutated myostatin protein fails to fit into its cell receptor

The signal to regulate growth is blocked, resulting in extra-large muscle development.

Expected offspring genotypic ratio for a cross between $Aa \times AA$

$50\%$ homozygous dominant ($AA$) and $50\%$ heterozygous ($Aa$).