Genetics Practice test #1

Which defines an organism that is homozygous for a trait?

• has two of the same alleles for a trait

• has two different genes for a trait

• has two different alleles for a trait

• has a blend of traits from mom and dad

Which is the ratio of green (G) pea plants to yellow (g) pea plants if both parents are heterozygotes? (Gg)

• 1 green : 2 yellow

• 1 green : 1 yellow

• 1 green : yellow

• 3 green : 1 yellow

Which is the ratio of tall (T) pea plants to short (t) pea plants in the punnett square?

• 1 Tall : 2 short

• 1 Tall :1 short

• 1 Tall : 3 short

• 3 tall :1short

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Looking at the punnett square, what would be the genotype of both parents?

• FF

• Ff

• ff

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Who was the "father of genetics"

• Charles Darwin

• Gregor Mendel

• Carl Linneaus

• Albert Einstein

An alternative form of a gene on a different chromosome. You get one from mom and one from dad.

• allele

• homologous chromosome

• DNA

• Histones

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The physical expression of traits, such as blue eyes, is called _____________________.

• heterozygote

• homozygote

• genotype

• phenotype

In humans, having freckles (F) is dominant to not having freckles(f). What would the parental genotypes be based on the offspring shown below?

• FF x Ff

• ff X ff

• Ff x Ff

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In humans, having freckles (F) is dominant to not having freckles(f). If an individual has the genotype (FF), they would have

• not have freckles

• have a few freckles

• have freckles

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Someone planted seeds for purple flowers expecting all purple flowers to grow. Some were white. How was this possible?

• Some of the flowers had mutations

• The seeds were homozygotes for the white gene

• The seeds were heterozygotes with a purple and white genes

• Incomplete dominance created purple and white flowers

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