Exploring Punnett Squares and Genetic Crosses

The video tutorial explains the concept of Punnett squares, starting with their origin and use in genetics to predict allele combinations. It covers monohybrid crosses using eye color as an example, explores incomplete dominance with flower color, and discusses blood type inheritance involving codominance and recessive genes. The tutorial concludes with a dihybrid cross example, illustrating independent assortment and the calculation of probabilities for different phenotypes.

What does it mean if a trait is described as 'incompletely dominant'?

• The trait only appears every other generation

• The trait is not visible in the phenotype

• The trait completely masks other traits

• The trait blends with another to produce a third phenotype

Which blood type demonstrates codominance?

• Type A

• Type B

• Type AB

• Type O

What is the probability of having a child with pink flowers from a cross between two heterozygous red and white flowered plants?

• 25%

• 50%

• 75%

• 100%

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What is the result of a cross between an individual with blood type AB and another with blood type AO?

• All offspring have either A or B blood type

• None of the above

• Offspring can have A, B, AB, or O blood types

• All offspring have AB blood type

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NGSS.HS-LS3-1

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What is a Punnett square primarily used for?

• Designing digital circuits

• Predicting weather patterns

• Analyzing genetic crosses

• Calculating chemical reactions

In a monohybrid cross of Bb x Bb, what is the probability of offspring being homozygous recessive?

• 0%

• 75%

• 50%

• 25%

In a dihybrid cross, what does it mean for genes to assort independently?

• Genes are on different chromosomes and inherited separately

• All genes are dominant

• Genes affect each other's inheritance

• Genes are on the same chromosome

What is the expected phenotype ratio for a dihybrid cross of two heterozygous parents (BbTt x BbTt) for dominant brown eyes and big teeth?

• None of the above

• 1:1

• 3:1

• 9:3:3:1

What is the probability of a child inheriting blue eyes and small teeth from parents both heterozygous for eye color and tooth size?

• 1/16

• 3/16

• 1/4

• 9/16

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NGSS.HS-LS3-3

Which scenario describes a situation of linked traits?

• Traits that blend together

• Traits that skip generations

• Traits that are on the same chromosome and inherited together

• Traits that are inherited independently

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