Question

For this modeling activity, assume that your species reproduces sexually. This assumption implies that it inherits half of its chromosomes from its mother and half from its father. Recall that in sexual reproduction, individuals inherit homologous pairs of chromosomes—one from the father and one from the mother. This arrangement allows for two alleles for every gene. The alleles can be dominant or recessive. You will model three traits controlled by three gene types on homologous chromosomes. Your genes should have these patterns of inheritance:

Trait 1: Simple dominant/recessive inheritance



Example: In pea plants, YY and Yy genotypes will yield yellow pea pods, but inherited yy will yield green pea pods.



Trait 2: Co-dominance



Co-dominance occurs when there’s more than one dominant allele and they express equally.



Example: Human blood type is co-dominant. IA (type A blood), IB (type B), and i (O blood) are controlled by A and B dominant alleles. If a person inherits A and B alleles, they’ll have AB blood. O blood is caused by two recessive alleles.



Trait 3: Incomplete dominance



Incomplete dominance occurs when there is more than one dominant gene, but the expression of both genes creates a blending of traits.



Example: RR = red flowers, WW = white flower, but RW = pink flowers.



Come up with your three traits and the possible inherited phenotypes.



The pic is an example of the chart I need to fill in. Needs to be a hybrid of two animals mixed together.

Answer 1

For the hybrid animals, Trait 1 represents antlers with a dominant allele and no antlers with a recessive allele. Trait 2 represents fur with stripes and spots with co-dominant alleles. Trait 3 represents a lion's mane with an incomplete dominance allele.

Step-by-step explanation:

Trait 1: Simple dominant/recessive inheritance

Example: In your hybrid animals, let's say that the dominant trait for Trait 1 is a set of antlers and the recessive trait is no antlers. If an individual inherits at least one allele for antlers from either parent (AA or Aa), they will have antlers. If an individual inherits the recessive allele for no antlers from both parents (aa), they will not have antlers.

Trait 2: Co-dominance

Let's say that for Trait 2, the dominant allele represents fur with stripes and the other dominant allele represents fur with spots. If an individual inherits both of these alleles (SS or SS or SS), they will have fur with both stripes and spots, resulting in a striped and spotted coat.

Trait 3: Incomplete dominance

For Trait 3, let's imagine that the dominant allele represents a lion's mane and the other dominant allele represents no mane. In this case, if an individual inherits the allele for a lion's mane (MM) and the allele for no mane (NN), their phenotype will display a blending of traits, resulting in a shorter, more sparse mane.