Genetics: Understanding Inheritance Patterns

This video tutorial covers three genetics questions relevant to the GED science test. It introduces essential vocabulary such as homozygous, heterozygous, dominant, and recessive genes, as well as genotype and phenotype. The video provides three example problems: determining flower color, tail presence, and creativity versus curiosity, using Punnett squares to illustrate genetic outcomes. The tutorial concludes with a call to action for further learning resources.

What does it mean if an organism is homozygous for a trait?

• It has two different genes for a trait.

• It has one dominant and one recessive gene.

• It has no genes for the trait.

• It has two identical genes for a trait.

Which of the following best describes a phenotype?

• The physical expression of genes.

• The genetic makeup of an organism.

• The DNA sequence of an organism.

• The combination of dominant and recessive genes.

In the context of flower color, what does 'homozygous dominant' mean?

• The flower has two recessive genes.

• The flower has no dominant genes.

• The flower has one dominant and one recessive gene.

• The flower has two dominant genes.

If a flower is heterozygous for color, what is its genetic makeup?

• Two dominant genes.

• Two recessive genes.

• One dominant and one recessive gene.

• No genes for color.

What is the expected ratio of offspring with tails when a heterozygous male is crossed with a female without a tail?

• 75% with tails, 25% without tails

• 25% with tails, 75% without tails

• 50% with tails, 50% without tails

• 100% with tails

In a Punnett square, what does a 'heterozygous' genotype look like?

• Two identical letters, both uppercase.

• No letters.

• Two identical letters, both lowercase.

• One uppercase letter and one lowercase letter.

When two heterozygous individuals are bred, what is the probability of an offspring being homozygous recessive?

• 0%

• 75%

• 25%

• 50%

What is the probability of an offspring being heterozygous when two heterozygous individuals are crossed?

• 0%

• 25%

• 50%

• 75%

If 'big C' is dominant for creativity, what is the probability of an offspring being creative when two heterozygous individuals are bred?

• 100%

• 75%

• 50%

• 25%

What is the genotype ratio when two heterozygous individuals are crossed?

• 1:2:1

• 1:1

• 2:1

• 3:1