Mendelian Genetics

The observable traits of an organism are known as its

• allele
• dominance
• phenotype
• genotype

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NGSS.HS-LS3-3

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

• variables
• gametes
• hybrids
• alleles

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NGSS.HS-LS3-1

Chromosomes that carry genes that code for the same products, such as hemoglobin or eye pigment, are said to be:

• homologous
• heterozygous
• heterogeneous
• homozygous

In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are heterozygous for this trait, the percent of offspring expected to exhibit dwarfness is

•  25%
• 100%
• 50%
• 0%

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NGSS.HS-LS3-3

In dragons, large scales (S) are dominant and small scales (s) are recessive. A dragon that is heterozygous for the trait is crossed with a dragon that has small scales. What should be the ratio of large-scaled dragons to small-scaled dragons among the offspring?

• 1:2
• 1:1
• 2:1
• 3:1

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Mendel discovered principles of inheritance because he:

•  observed simultaneously all of the characteristics in which the parents differed
•  ignored all characteristics except a few markedly contrasting ones which he studied carefully
• studied only the offspring obtained from a single mating
• was smarter than any other scientist of his time

The gene makeup of an organism for a particular trait is known as its

• dominance
• phenotype
• allele
• genotype

Tags

NGSS.HS-LS3-1

In pea plants, the allele for green pods (G) is dominant and the allele for yellow pods (g) is recessive. A researcher crosses two green pea plants, and the in F₁ generation, all of the offspring exhibit green pods. Can you determine the genotypes of both parents

• No, they could be Gg and GG OR GG and GG
• Yes, they are Gg and GG
• Yes, they are GG and GG
•  No, they could be Gg and Gg OR GG and Gg

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the percentage of homozygous recessive offspring?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3