Introduction to Genetics (AKS 3a)

What is the definition of a gene?

• A gene is a section or part of your DNA. It is a code for proteins that determines your traits.

• A gene is what you wear to school

• A gene is a physical characteristic you can see

• A gene is located in your nucleus. You inherit one from your mom and one from your dad.

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My mom has dominant brown eyes and my dad has recessive blue eyes. I have blue eyes. How can this be?

• It is not possible

• I inherited genes only from my dad

• I inherited the recessive gene from my dad

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I am heterozygous for freckles. Freckles are a dominant allele (F), and no freckles is recessive (f). What would my genotype be?

• FF

• ff

• Ff

• I can't tell based on the information given.

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True or False: Recessive genes are always lowercase and they overpower (or dominate) dominant genes.

• True

• False

This makes up our chromosomes. It is tightly-wound in coils.

• Chromosome

• DNA

• gene

• Allele

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True or False: We get half of our genes from our mom and half from our dad.

• True

• False

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My mom has dimples (dominant) and my dad does not (recessive). I have dimples, but my sister does not. How can this happen?

• I got all my genes from my mom.

• My sister got all her genes from my dad.

• My sister got both of her chromosomes from my dad.

• My sister and I got a different combination of alleles our dad and mom

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What do these letters mean to a scientist: Aa?

• Homozygous dominant

• Homozygous recessive

• Two dominant alleles

• One dominant allele & one recessive allele

Which of the following is an allele?

• Brown hair

• Blue eyes

• T or t

A red petaled flower (R) is crossed with a white petaled flower (r). The offspring is heterozygous. What is the phenotype of the baby flower?

• Rr

• RR

• white

• red

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