Mendelian Genetics and Human Genetics

Different forms of a gene are referred to as —

• alleles

• autosomes

• chromatids

• loci

What is the the ratio for the plant height of the F 2 generation?

• 2.84:1

• 2.95:1

• 2.86:1

• 2.91:1

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What is the the ratio for the seed color of the F 2 generation?

• 3.01:1

• 2.95:1

• 2.96:1

• 2.81:1

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Albinism is caused by the lack of the pigment melanin. It is caused by the inheritance of a mutated gene. On this pedigree chart, how many people have it?

• 1

• 2

• 5

• 4

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Which Punnett squares correctly calculate the genetic ratios between a homozygous parent

and a heterozygous parent?

• A only

• A and B

• A and C

• B and D

• D only

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Two birds of the same species have different colored feathers: one has red feathers (R) and the other has yellow (r). They mate and have four offspring; three with red feathers and one with yellow. What would explain why more offspring did not have yellow feathers?

• Dominant alleles are always expressed if present

• Recessive alleles have a 25% probability of being expressed.

• Recessive alleles are only expressed more frequently in alternate generations.

• Dominant alleles are the result of a mutation and are rarely expressed.

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According to Mendel, what kinds of phenotypes are not seen in the offspring of a cross between homozygous dominant (T) and homozygous recessive (t) pea plants?

• recessive

• dominant

• autosomal

• sex-linked

In pea plants, Mendel found that tall plants and yellow seeds are both dominant. The phenotype for a pea plant with the genotype TtYy would be —

• short with green seeds

• tall with yellow seeds

• tall with green seeds

• short with yellow seeds

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A student made a pedigree diagram of his family for the earwax trait. The gene for the earwax trait

has two alleles, one that codes for dry earwax and another for wet earwax. The pedigree shows the

inheritance of the trait in the student’s family. What can he conclude?

• The dry ear wax trait is autosomal recessive.

• The dry ear wax trait is sex-linked recessive on the X chromosome

• The wet ear wax trait is recessive

• The wet ear waxy trait is sex-linked recessive on the Y chromosome.

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In a species of winter squash, the trait for lobed leaves (L) is dominant over the trait for unlobed leaves (l). What will the likely outcome be of a cross between two parent winter squash where both have Ll alleles? (choose all that apply)

• Offspring have a 50% chance of inheriting (Ll) alleles.

• Offspring have a 50% chance of inheriting lobed leaves.

• Offspring have a 25% chance of inheriting unlobed leaves.

• Offspring have a 25% chance of inheriting (ll) alleles.

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