Genetics Quiz

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

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

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

G = green, g = yellow
The genotype for a yellow plant is...

• GG
• Gg
• gg
• all of the choices result in yellow

An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele

Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

• 50% tall and 50% short
• 75%tall and 25% short
• 100%short

What type of "square" helps us solve genetic problems?

• carpenter square
• Mendel square
• Punnett square
• genetic square

TT, tt, PP, pp, SS, ss are examples of alleles that are?

• homozygous
• heterozygous
• different
• homologous 

Y for yellow body is dominant over y for blue body.  What alleles would produce yellow bodies?

• YY,yy
• Yy,yy
• YY only
• YY,Yy

"The Great White Shark was 20 feet in length.  Phenotype or Genotype?

• phenotype
• genotype