Representation:
A1A1 = Homozygous dominant= Red
A1A2 = Heterozygous = pink
A2A2= recessive = white
Cross 1: Red x White
A1A1 x A2A2
A2 |
A2 |
|
A1 |
A1A2 |
A1A2 |
A1 |
A1A2 |
A1A2 |
· All pink
Cross 2: Red x Pink
· A1A1 x A1A2
A1 |
A2 |
|
A1 |
A1A1 |
A1A2 |
A1 |
A1A1 |
A1A2 |
Red: pink = 1:1
Pink = 1/2
· A1A2 x A1A2
A1 |
A2 |
|
A1 |
A1A1 |
A1A2 |
A2 |
A1A2 |
A2A2 |
· Phenotype ratio: Red: Pink: white = 1:2:1
· Pink = ½
Probability of 3 offspring to be pink = 1/2 x 1/2 x1/2 = 1/8
If total is 9, probability = 1/8 x 9 =9/8
15. The gene for petal color in a flower has incomplete dominance, so that individuals with...
15. The gene for petal color in a flower has incomplete dominance, so that individuals with two Al alleles (AIAI) are red, individuals with two A2 alleles (A2A2) are white, and individuals with one of each allele (A1A2) are pink. In a cross between a red flower and a white flower, what is the probability of getting a pink offspring? (2 points) In a cross between a red flower and a pink flower, what is the probability of getting a...
15. The gene for petal color in a flower has incomplete dominance, so that individuals with two Al alleles (AIAI) are black, individuals with two A2 alleles (A2A2) are white, and individuals with one of each allele (A1A2) are mottled. In a cross between two black flowers, what is the probability of getting a mottled offspring? (2 points) In a cross between a black flower and a mottled flower, what is the probability of getting a black offspring? (2 points)...
In a gene with incomplete dominance for petal color, there are 2 possible alleles: Ar (codes for red petals) and Aw (codes for white petals). The heterozygote codes for pink petals. In the population, there are 500 red individuals, 250 pink individuals, and 250 white individuals. a) What is the frequency of each phenotype? b) What is the frequency of each genotype?
0. In snapdragons, the alleles for flower color show incomplete dominance. CRCR produces red flowers; CWCW produces white flowers and CRCW produces pink flowers. The height of the plant is determined by a separate gene with regular dominant and recessive alleles. Normal height (D) is dominant over dwarf height (d). a. A snapdragon that is heterozygous normal in height and has white flowers is crossed with a plant that is dwarf in height and has red flowers. What is the...
In a cross between two mottled offspring, what is the probability of getting a mottled offspring? (2 points) In a cross between two mottled flowers, if there are two offspring, what is the probability of getting one black offspring and one white offspring? (2 points) In a cross between two mottled flowers, if there are two offspring, what is the probability of getting one white offspring and one mottled offspring? (2 points) In a cross between mottled flowers, if there...
Activity 2. Incomplete Dominance 2a. Let's carry the flower example one generation further. Assume two pink-flowered plants were crossed. What is the probability of each color appearing in the F2 generation? Red 2so Pink White A cross is made between a red flower and a pink flower (assume incomplete dominance). What is the probability of producing a white-flowered plant? 2b. EXTRA CREDIT In rabbits, the genotype BB produces a black coat color, but Bb produces a brown coat color. Rabbits...
6. In a plant in which flower color is produced by incomplete dominance, what is the probability that the first offspring would be pink-flowered from a cross between a pink-flowered and a white-flowered plant?
II. MONOHYBRID PROBLEMS WITH INCOMPLETE DOMINANCE 8. Petunia flower color is governed by two alleles, but neither allele is truly dominant over the other. Petunias with the genotype R R are red-flowered, those that are heterozygous (R W ) are pink, while those with the (WW ) genotype have white flowers. This is an example of incomplete dominance. a. If a white-flowered plant is crossed with a red-flowered plant, what is the genotypic ratio of the F1? __________________________________________________________ b. What...
PPPPPP Step 5: Determine the phenotype of cach possible allele combination shown in the offspring. In this instance, three of the offspring Chose with the genotypes EE, Ee, and Be) have free earlobes, because the free earlobe allele is dominant to the attached-carlobe allele. One offspring, ec, has attached earlobes. Therefore, the proba- bility of having offspring with free earlobes is 3/4 and with attached earlobes is 1/4. Additional Single-Factor Inheritance Problems (One Trait Followed from One Generation to the...
Question 1 (1 point) In a species of flowering plant, petal color is determined by one gene with two alleles, R and W. Individuals homozygous for allele R have red petals, and those homozygous for allele Whave white petals. Ris dominant to W. You cross a pure- breeding red flowered plant with a pure-breeding white flowered plant to create an F1 generation. You then cross two individuals from the F1 generation to create an F2 generation. What proportion of the...