Genetics Unit Review

Which genotype is homozygous?

• Xxtt

• XXTt

• XxTt

• xxTT

A pet rabbit named Sparky has a dark coat (D, the dominant allele) and was mated with an albino female rabbit named Lucy (d, the recessive allele). A litter of six offspring were born, all with dark coats. Lucy was then mated with a different dark coated rabbit named Elwood. Some of Elwood's and Lucy's litter were dark coated and other were albinos. What is the most probable genotype for Sparky, Lucy and Elwood?

• Sparky - DD Lucy - dd Elwood - Dd

• Sparky - DD Lucy - Dd Elwood - Dd

• Sparky - Dd Lucy - dd Elwood - DD

• Sparky - Dd Lucy - dd Elwood - dd

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In a cross between to true breeding pea plants for yellow (dominate) and green (recessive) peas, explain with the F1 generation is all yellow.

• The parents transferred only dominate alleles

• The F1 genotypes are heterozygous, and the dominate allele is expressed

• The yellow seed color is dominate over the green seed color

• The F1 genotypes are dominate homozygous

Scientists have discovered a genetic condition in a certain fish species that causes gills not to form during development. This results in death. Which scenario has to occur in order for this condition to be passed from parent to offspring?

• There must be random mutations occurring in the species.

• The parents must have heterozygous genotypes

• The offspring must interbreed with each other

• There must be dramatic changes to the environment

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Cystic fibrosis is a genetic disorder that damages the tissues in the lungs. A- normal and a- has the disorder. Which cross between parental genotypes would result in a child expressing the condition?

• Aa x Aa

• aa x aa

• aa x Aa

• aa x AA

• Aa x AA

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What do Roman Numerals represent on a pedigree chart?

• Dates

• Generations

• Amount of people

• Nothing

What is a monohybrid cross?

• A cross looking at 2 traits

• A cross looking at no traits

• A cross looking at 1 trait

• A cross looking at many alleles

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If unaffected parents have affected offspring, the pedigree is showing...

• Autosomal Recessive

• Autosomal Dominate

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Genetics is

• a genotype for a trait in which the alleles are different

• Different forms of a gene

• A branch of biology that studies heredity

• The passing of traits from parents to offspring

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An allele is..

• The physical characteristic of a trait

• the genetic makeup of an individual

• a cross among one pair of contrasting traits

• different forms of a gene