Vocabulary
What is incomplete dominance?
The dominant trait is not completely expressed when the recessive trait is present.
You will need to complete a Punnett square for this question. If a mom is Bb (brown) for brown hair and the father's genotype is bb (blonde), what percentage of the offspring will have brown hair?
50% Bb, Bb, bb, bb
What is the difference between incomplete dominance and co-dominance?
Incomplete dominance is when the dominant trait is not fully expressed when the recessive trait is also present. Co-dominance is when neither allele is dominant or recessive and both get expressed.
Two different alleles of a specific single-gene trait are both expressed simultaneously.
Mr. Krabbs and Mrs. Krabbs had a Lil' Krabby. Mr. Krabbs is homozygous for his tall eyeballs (TT), while Mrs. Krabbs is heterozygous (Tt) for her tall eyeballs. What is the probability that their Lil' Krabby will have tall eyeballs?
100% probability their Lil' Krabby will have tall eyeballs.
Which option is an example of codominance?
1. Blood type
2. Ear wax
3. Wavy hair
1.
What is epistasis?
The action of one gene does affect another gene, even one on a different chromosome.
Blue body color is dominant to Pink. What are the phenotypes?
1. bb
2. Bb
1. Pink
2. Blue
Which option is an example of incomplete dominance in humans?
1. Blood type
2. Ear Wax
3. Wavy hair
3.
What is a genotype?
The set of genes. For example, BW.
Assume that one of Ms. Moeller's imaginary adult child, who is heterozygous for brown eyes (Bb), marries a person that was also heterozygous. Create a Punnett square to show the possibilities that would result if they had kids.
75% of the grandkiddos would have brown eyes.
25% of the grandkiddos would have blue eyes.
Which option is an example of simple Mendelian genetics in humans?
1. Blood type
2. Ear wax
3. Wavy hair
2.
What is phenotype?
All of the observable characteristics which are influenced both by its genotype and by the environment.
Do Snapdragons obey the laws of Mendelian genetics? Why or why not?
No way! Snapdragons do not obey the laws of Mendelian genetics because they are a great example of incomplete dominance. Rr-pink, RR-red, rr- white
What blood type is the universal donor? (can donate to anyone)
What blood type is the universal recipient? (can receive blood from anyone)
Type O
Type AB