WorksheetsPatterns of Inheritance - Complete,Incomplete & Co-Dominance
Total questions: 11
Worksheet time: 22mins
Hitchhiker’s thumb (able to bend the thumb backward from strait) is a trait that is controlled by dominant and recessive alleles. A straight thumb (S) is dominant to the “hitchhiker thumb” (s) trait. If one parent is has hitchhiker’s thumb and the other is heterozygous what percentage of their offspring could have a straight thumb?
25%
50%
75%
100%
Hitchhiker’s thumb (able to bend the thumb backward from strait) is a trait that is controlled by dominant and recessive alleles. A straight thumb (S) is dominant to the “hitchhiker thumb” (s) trait. If one parent is has hitchhiker’s thumb and the other is heterozygous what percentage of their offspring could have hitchhiker's thumb?
0%
25%
50%
75%
Japanese four o’clock flowers can be red, white or pink (an intermediate shade). Which pattern of inheritance best describes this color scheme?
Complete dominance
Co-dominance
Recessive inheritance
Incomplete dominance
If two pink flowers from question 2 were crossed, what percentage of the offspring could be pink? red? white?
100% pink
50% pink; 25% red; 25% white
50% red; 50% white
33% pink; 33% red; 33% white
Consider the flowers from question 4. If a pink flower and white flower were crossed, what percentage of their offspring could be red?
0%
25%
33%
50%
Human blood types are controlled by multiple alleles. The AB blood type is formed by A and B alleles that are codominant with one another. Type A blood and type B blood are both dominant to type O.
What genotype(s) can result in type A blood?
AA only
AA or AB
AB or Ao
AA or Ao
Hair texture follows a pattern of incomplete dominance. A cross between curly hair (CC) and straight hair (SS) produce the intermediate wavy hair (CS). If one parent has wavy hair and the other has straight hair, what percentage of their offspring will have curly hair?
0%
25%
50%
75%
Albinism is a recessive genetic condition in which pigmentation (generally from melanin) is lacking. An individual with true albinism will have white hair (eyelashes & eyebrows included), very pale skin and red eyes. If each parent is heterozygous, what percentage of their offspring could be affected by albinism?
0%
25%
50%
75%
Magnolia trees are my favorite. The three magnolias around my house are starting to bloom, with flowers that are dark pink around the center and white around the outer edges. Which pattern of inheritance best describes this color scheme?
Complete dominance
Incomplete dominance
Co-dominance
Recessive inheritance
If “P” represents a dark pink allele and “W” represents a white allele, what might the genotype of the magnolia flowers described in question #9?
WW
PP
PW
RR
If two of the magnolia trees from my yard were crossed, what are the possible genotypes and phenotypes of their offspring?
100% PW (pink and white)
50% PP (pink); 50% WW (white)
25% PP (pink); 50% PW (pink and white); 25% WW (white)
100% WW (white)
