Genetics quiz 2021

Genotype refers to the ...

• physical expression of the genes
• the possible combination of alleles in a gene
• whether an allele is dominant or recessive
• how an organism will appear

What is a phenotype

• The genetic make up (code)
• The physical trait

having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

having two different genes for a trait (sometimes called hybrid).

• protein
• homozygous
• heterozygous
• genotype

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

Which of the following is homozygous dominant?

• Yy
• Y
• yy
• YY

Females-XX; MalesXY.  A couple has 4 girls.  What is the chance the next child will be a boy?

• 75%
• 100%
• 25%
• 50%

If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?

• tall
• short
• medium
• not enough info

Mutations are a change in what?

• DNA
• tRNA
• genotype
• phenotype

If an organism has 2 identical alleles for a particular trait then it is

• heterozygous

• homozygous

• hybrid