Punnett Square Terms

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An allele that is masked when a dominant allele is present. The "weaker" gene. 

• Dominant Allele
• Recessive Allele

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An allele whose trait always shows up in the organism when the allele is present. The "stronger" gene. 

• Dominant Allele
• Recessive Allele

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What is called when a organism has  two different alleles for a trait. Tt or Rr

• Heterozygous
• Homozygous
• Domozygous
• Thermozygous

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What is called when a organism has two identical alleles for a trait. TT or tt. RR or rr

• Heterozygous
• Homozygous
• Domozygous
• Thermozygous

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Which of these is homozygous recessive?

• Rr
• rR
• RR
• rr

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Gregor Mendel is often called ....

• The father of heredity.
• The father of genetics.
• The king of peas
• The father of punnett squares.

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This image shows a...

• Punnett Square
• Phenotype
• Genotype
• Dominant allele

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A chart that shows all the possible combinations of alleles that can result from a genetic cross

• dominant allele

• codominance

• probability

• Punnett Square

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T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

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An organism that has two different alleles for a trait (hybrid)

• homozygous

• heterozygous

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If a homozygous recessive woman marries a heterozygous man. What is the chance of having a baby with dimples?

• 0%

• 25%

• 50%

• 75%

• 100%

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A heterozygous woman marries a man who is homozygous recessive. What are the chances of a curly hair baby?

• 0%

• 25%

• 50%

• 75%

• 100%

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A dihybrid cross shows the possible outcomes of _______ 

• two alleles
• two parents
• two traits/characters
• a self pollination

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What goes in box 1

• AABb
• AABB
• aabb
• AaBb

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What goes in box 3

• Aabb
• AABB
• AAbb
• aaBb

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What gamete possibilities could come from this parent's genotype?

• AB, AB, aB, aB
• Ab, AB, Ab, ab
• Ab, Ab, Ab, Ab
• AB, aB, ab, aB

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Which trait is always expressed when present?

• recessive
• dominant
• phenotype
• allele

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When an ovum is first fertilized it is known as

• a nucleus

• an embryo

• a zygote

• a fetus