Exploring Simple Genetics and Punnett Squares

The video tutorial covers basic genetics, explaining how DNA is inherited from parents and the concept of alleles. It distinguishes between dominant and recessive alleles and their impact on genotype and phenotype. The tutorial includes examples using wolves to illustrate genetic traits and introduces Punnett squares for predicting offspring traits. Practice problems are provided to reinforce learning, and the concept of test crosses is explained to determine unknown genotypes.

How much of your DNA do you inherit from your mother?

• All of it

• Half of it

• A quarter of it

• None of it

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What are the two copies of each gene called?

• Proteins

• Alleles

• Chromosomes

• Nucleotides

Which type of allele always shows up in the phenotype?

• Silent allele

• Mutant allele

• Dominant allele

• Recessive allele

What is the term for having two of the same alleles?

• Heterozygous

• Homozygous

• Monozygous

• Dizygous

If a plant has a genotype of Big T little T, what will its phenotype be?

• Cannot be determined

• Medium

• Tall

• Short

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What is the phenotype of a wolf with the genotype Big D Big D?

• Light fur

• Dark fur

• Spotted fur

• Striped fur

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What tool is used to predict the traits of offspring?

• Genetic map

• Punnett square

• DNA sequence

• Chromosome chart

In a Punnett square, what does a 1 out of 4 probability represent?

• 75%

• 50%

• 25%

• 10%

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What is the purpose of a test cross?

• To determine the phenotype

• To determine the genotype

• To find the DNA sequence

• To identify mutations

In a test cross, what type of individual is the unknown genotype mated with?

• Heterozygous

• Recessive

• Dominant

• Homozygous