Download 10.11.3d-IncompleteD.. - Circle

Sec.
Name:
Experiment:
_
Incomplete Dominance
(B. Science 10-11-3d)
Purpose: To diagram inheritance in an
incomplete dominance.
Materials:
brain
Methods:
1. When a snapdragon plant bearing red flowers
is crossed with a snapdragon plant bearing white
flowers, plants bearing pink snapdragons are
produced. (This is an example of incomplete
dominance). If the male parent is homozygous for
red snapdragons, what is it's genotype?
2. What kind of gene will be present in the pollen
(sperm)?
3. if the female is homozygous for white, what kind of gene will be present in each
eqg?
4. Do a Punnett square to cross these adults to determine the F1. What is the F1 of
this cross.
5. Cross two plants producing pink snapdragons to obtain the F2 generation in the
second Punnett square. Indicate the ratios of colors in the snapdragon flowers
produced.
Results:
1. genotype:
2. sperm:
3. gene:
4 .. F1:
5. ratio:
_
_
1
_
_
red
white
5. F1 to get F2
4. P1 to get F1
1
I
__
__
__
I
I
I
_1_'
1
_
1_'
I
_1_1
1
_pink
Conclusions:
Codominance occurs when two inherited traits combine and produce a third
trait. When working problems with codominance, small letters are not used in the
Punnett square. Instead, all traits are represented by capital letters. For example,
black Andalusian chickens have BB genes for feather color. White Andalusian
chickens have WW genes for white feather color. Blue Andalusian chickens have BW
genes for feather color.
1. Determine the genes of offspring of one black and one white Andalusian
% of offspring with black feathers
1
I
% of offspring with white feathers
1
% of offspring with blue feathers
_______
chicken.
_
_
_
Sec.
Name:
_
2. Determine the genes of offspring of two blue Andalusian chickens.
% of offspring with black feathers
__
.
1
% of offspring with white feathers
_______
1
% of offspring with blue feathers
______
1
_
_
.
Shorthorn Cattle have different color hair. Red shorthorn cattle have RR genes,
white shorthorn cattle have WW genes and roan shorthorn cattle have RW genes.
3. Determine the genes of offspring of one red and one roan parent.
% of offspring with red coats
______
1
% of offspring with white coats
_______
1
% of offspring with roan coats
______
1
_
_m
4. Determine the genes of offspring of two roan
% of offspring
______
1
% of offspring
_______
1
1
% of offspring
parents.
with red coats
with white coats
with roan coats
_
_
_
_
_
Discussion:
Petal color of four o'clocks is inherited by codominance. Plants with RR genes
have red flowers. Plants with FF genes have white flowers. Plants with RF genes
have pink flowers.
1. Sarah planted four o'clocks in her garden. When the flowers bloomed, Sarar. saw
that all her flowers were pink. What were the genes of the parent plant?
2a. Read Romans 1: 21 - 28,32.
verses 21 - 23, 25?
What general train of thought is being expressed in
2b. As a result of this general activity described in verses 21 - 23, 25 and because
God values the freedom for people to chose their destiny, what does God then allow to
happen to these people (verses 24, 26, 28), ?
2c. List the sinful things that start to develop in the peoples lives because they had
separated themselves from God (verses 26, 27).
2d. Not only do these people live the lives described in verses 26, 27, what is their
attitude of those that participate in these things (last part of vs. 32).
2e. Although the homosexual community is trying to make the general public accept
homosexuality as a biological (genetic) thing that they cannot help, thus not change,
based on this text and I Cor. 5:9 what is God's viewpoint of this?
2f. We need to show Christian kindness and patience with homosexuals as we
discuss these issues with them. Besides this what does Rom. 2: 1 -3 warn us of?