Exam Review Genetics

What happens to a recessive allele when a dominant allele is present?

• The recessive trait takes over.

• The recessive trait will not show.

• The recessive and dominant traits will blend together.

• You will have recessive traits in half your cells and dominant in the other half.

If a person is heterozygous for their genotype, which could they be?

• BB

• bb

• Bb

If an animal has a purebred recessive genotype, which of the following could be their code?

• TT

• Tt

• tt

• TR

Each box in a punnett square shows:

• One allele from a parent

• The phenotype of the offspring

• The possible genotypes of an offspring

• Only the dominant trait

Any cell that has 23 chromosomes total is called...

• Diploid

• Sperm

• Haploid

• Zygote

What is a zygote?

• A male sex cell

• Any cell with 46 chromosomes

• A female sex cell

• A fertilized egg

Body cells have ____ chromosomes.

• 23 pairs of

• 46 pairs of

• 23

• 13

A gamete is....

• A cell with 46 chromosomes

• A sex cell

• A body cell

• A fertilized egg

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the genetic makeup of an organism

• heterozygous
• punnet square
• genotype

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A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?

• 100% BB
• 75% BB and 25%Bb
• 50 % BB and 50% Bb
• 50% Bb and 50% bb

Tags

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