Genetics Quiz

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

In a certain species of flowers, the color yellow is dominant over white. What genotypes would produce yellow flowers?

• YY,yy
• Yy,yy
• YY only
• YY,Yy

The observable traits of an organism are known as its

• allele
• dominance
• phenotype
• genotype

A _______ is an alternative form a gene.

• chromosome

• sister chromatid

• allele

• telomere

a trait that is masked unless 2 copies are present is ________________________

• recessive

• dominant

• weak

• hidden

A genotype where only dominant alleles were passed on

from both parents for one trait

• Homozygous Recessive

• Homozygous Dominant

• Heterozygous Recessive

• Homozygous Recessive

A genotype where one dominant and one recessive allele inherited.

• Heterozygous Recessive

• Homozygous Dominant

• Homozygous Recessive

• Heterozygous

In Mendel's pea plants, yellow pea color is dominant to green. What percentage of offspring would you expect to be yellow if a heterozygous yellow is crossed with a green pea plant?

• 25%

• 50%

• 75%

• 100%

In Mendel's pea plants, purple flower color is dominant to white. What percentage of offspring would you expect to be white if two heterozygous plants are crossed?

• 25%

• 50%

• 75%

• 100%

A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?

• 0%
• 25%
• 50%
• 100%