Question

question 3
10 pts
an example of codominance would be -
colorblindness.
type a blood crossed with type b blood produces ab blood type.
a tall pea plant crossed with a short pea plant produces a medium pea plant.
two individuals heterozygous for brown hair produce a child with blonde hair.
question 4
10 pts
in a particular species of flower, flower color is incompletely dominant. based on this information, what color would the offspring be that result from a cross between a homozygous red flower (rr) and a homozygous white flower (rr)? rr - red, rr - white, rr - pink

Explanation:

Question 3

• Colorblindness: It is an X - linked recessive disorder, not related to codominance.
• Type A blood (e.g., $I^A I^A$ or $I^A i$) crossed with type B blood (e.g., $I^B I^B$ or $I^B i$) producing AB blood type ($I^A I^B$): In codominance, both alleles are expressed equally in the phenotype. In AB blood type, both A and B antigens (from $I^A$ and $I^B$ alleles) are present on the red blood cells, which is a classic example of codominance.
• Tall pea plant crossed with short pea plant producing medium pea plant: This is an example of incomplete dominance, where the heterozygous phenotype is an intermediate between the two homozygous phenotypes, not codominance.
• Two heterozygous brown - haired individuals producing a blonde - haired child: This is an example of a recessive trait being expressed when two carriers (heterozygous) are crossed, following Mendelian inheritance for a recessive allele, not codominance.

Step 1: Determine the gametes

The homozygous red flower (RR) can only produce gametes with the R allele. The homozygous white flower (rr) can only produce gametes with the r allele.

Step 2: Determine the genotype of the offspring

When we cross RR and rr, using a Punnett square (or simple combination of gametes), the offspring will have the genotype Rr.

Step 3: Determine the phenotype based on incomplete dominance

Given that in this species, flower color shows incomplete dominance, and the phenotype for Rr is pink (as given: RR - red, rr - white, Rr - pink).

Answer:

B. type A blood crossed with type B blood produces AB blood type.

Question 4