Question

Some heterozygotes express a phenotype that is intermediate between the dominant and recessive phenotype. For example, in snapdragons the gene for red flower pigment is dominant and the gene for white pigment is recessive. However, heterozygotes are pink. The dominant allele does not completely mask expression of the recessive allele: it is incompletely dominant. 1. By observing flower color in snapdragons, is it possible to unambiguously determine the genotype? YES/NO Is the same true for flower color in peas? YES/NO Why or why not? Another inheritance pattern of note is that of codominance. Here, both alleles for the same characteristic can be expressed. A common example of this is human ABO blood type. The alleles for the surface antigens are both dominant; the allele for no surface antigen is recessive. father | mother A | B | O ---|--- A | AA | AB | AO B | BA | BB | BO O | OA | OB | OO alleles blood type A+A = A A+O = A A+B = AB B+B = B B+O = B O+O = O 2. If two individuals with blood type AB marry, what are the odds that each of their children will have the AB blood type? 3. A disputed paternity case! Hermione's new baby has a blood type of O. Her blood type is B and Ron Weasley's is A. Harry Potter (blood type AB) insists he is the child's father. CAN THIS BE TRUE??! Why or why not?

          Some heterozygotes express a phenotype that is intermediate between the dominant and recessive phenotype. For example, in snapdragons the gene for red flower pigment is dominant and the gene for white pigment is recessive. However, heterozygotes are pink. The dominant allele does not completely mask expression of the recessive allele: it is incompletely dominant.
1. By observing flower color in snapdragons, is it possible to unambiguously determine the genotype? YES/NO

Is the same true for flower color in peas? YES/NO Why or why not?

Another inheritance pattern of note is that of codominance. Here, both alleles for the same characteristic can be expressed. A common example of this is human ABO blood type. The alleles for the surface antigens are both dominant; the allele for no surface antigen is recessive.

father | mother A | B | O
---|---
A | AA | AB | AO
B | BA | BB | BO
O | OA | OB | OO

alleles blood type
A+A = A
A+O = A
A+B = AB
B+B = B
B+O = B
O+O = O

2. If two individuals with blood type AB marry, what are the odds that each of their children will have the AB blood type?

3. A disputed paternity case! Hermione's new baby has a blood type of O. Her blood type is B and Ron Weasley's is A. Harry Potter (blood type AB) insists he is the child's father. CAN THIS BE TRUE??! Why or why not?

Some heterozygotes express a phenotype that is intermediate between the dominant and recessive phenotype. For example, in snapdragons the gene for red flower pigment is dominant and the gene for white pigment is recessive. However, heterozygotes are pink. The dominant allele does not completely mask expression of the recessive allele: it is incompletely dominant.
1. By observing flower color in snapdragons, is it possible to unambiguously determine the genotype? YES/NO

Is the same true for flower color in peas? YES/NO Why or why not?

Another inheritance pattern of note is that of codominance. Here, both alleles for the same characteristic can be expressed. A common example of this is human ABO blood type. The alleles for the surface antigens are both dominant; the allele for no surface antigen is recessive.

father | mother A | B | O
—|—
A | AA | AB | AO
B | BA | BB | BO
O | OA | OB | OO

alleles blood type
A+A = A
A+O = A
A+B = AB
B+B = B
B+O = B
O+O = O

2. If two individuals with blood type AB marry, what are the odds that each of their children will have the AB blood type?

3. A disputed paternity case! Hermione's new baby has a blood type of O. Her blood type is B and Ron Weasley's is A. Harry Potter (blood type AB) insists he is the child's father. CAN THIS BE TRUE??! Why or why not?

Added by Ryan W.

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