Mendelian Genetics Review

In pea plants, tall (T) plant alleles are dominant to short (t) plant alleles. If two tall plants (each with the genotype Tt) are crossed, what is the probability that the cross would result in a short pea plant?

• 25%

• 50%

• 75%

• 100%

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Genes determine the characteristics, or __?__, that an individual can have.

• chromosomes

• cells

• genetics

• traits

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The observable traits of an organism are known as its

• allele
• dominance
• phenotype
• genotype

Each parent contributes one of the genes for a particular trait. The genes of the pair are called:

• variables
• gametes
• hybrids
• alleles

The color black is dominant in guinea pigs. The phenotypes of homozygous black guinea pigs and heterozygous black guinea pigs are:

• black
• gray
• BB and Bb
• white

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What is the percentage of homozygous recessive offspring?

• 0%
• 25%
• 50%
• 75%

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Dominant alleles are represented by a(n)

• phenotype
• lower case letter
• upper case letter
• punnett square 

The instruction of one allele covers up the instruction

of the other allele in a homologous pair. Symbolized by a capital letter.

• Recessive Allele

• Dominant Allele

• Heredity

• Trait

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During meiosis, the homologous pairs of chromosomes and the matching alleles are lined up independently.

Offspring are a mix of maternal genes and paternal genes.

This increases genetic variation.

• Homozygous Dominant

• Law of Segregation

• Crossing Over

• Independent Assortment

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During meiosis and gamete formation, homologous (paired up) alleles split up

• Phenotype

• Law of Segregation

• Genotype

• Dihybrid Cross

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