7. (4 points) Brown bears are animals that like to eat fish. While most like to
ID: 275168 • Letter: 7
Question
7. (4 points) Brown bears are animals that like to eat fish. While most like to eat salmon, a small number of will also eat perch. Also, some like to ride bicycles, whereas most do not like to ride. The genes for fish eating and bicycle riding are on the same chromosome, meaning that they are linked. Please use the following designations: S-Salmon eater, s-perch eater. B = non- bicycle rider, b - bicycle rider. You wish to cross a purebred (for both genes) salmon-eating bicycle riding bear with a non- purebred salmon eating, bicycle riding bear. Please answer the following questions below: a. (1 points) What is the genotype of the purebred salmon-eating, bicycle riding bear? b. (1 points) What is the genotype of the non-purebred salmon-eating, bicycle riding bear? c. (2 point) You perform this initial cross to create the F1 generation. What is the genotypic and phenotypic ratio of this cross? EXTRA CREDIT- PLEASE ANSWER BASED ON QUESTION 7 (2 points) You take two F, individuals from question 7 of DIFFERENT genotypes and cross them together to create an F: generation, what are the phenotypic and genotypic ratios?Explanation / Answer
Q) In the question S stands for salmon eating bear , s- for perch eating bear, B- for Non-bicycle riding bear , b- for Bicycle riding bear .
Here a pure breed salmon eating bicycle riding bear crossed with a non-pure breed salmon eating bicycle riding bear .
so the genotype of P generation will be = Pure breeding for ( both genes) salmon eating bicycle riding bear is SSbb and Genotype of Non -pure breed salmon eating bicycle riding bear is Ssbb , because here S or salmon eating bear gene is dominant over s the perch eating gene, and B - Non-bicycle riding bear gene is dominant over b - The bicycle riding bear.
Q7 a ) Genotype of Pure breed salmon eating bicycle riding Bear is -----
Answer- SSbb ( Homozygous for salmon eating gene as it is in pure form and supposed to be homozygous for Bicycle riding gene, as it is a recessive character)
Q7 b) Genotype of Non-pure breed salmon eating Bi-cycle riding bear is - Ssbb(It is heterozygous for salmon eating gene and homozygous for bicycle riding as bicycle riding gene is recessive , it got to present two genes of same type to represent the recessive character).
Q7) c) A initial cross is done to create F1 generation , what is the genotypic ratio and phenotypic ratio?
Answer- Genotypic ratio is 1:1 , and Phenotypic ratio is 1 that is 100% all the offsprings will be salmon eating and bicycle riding.
Explanation- The P generation has genotypes SSbb crossed with Genotype Ssbb.
They give rise to- SSbb gives a single type of gamete that is Sb, and Ssbb gives rise to two types of gametes that is Sb and sb .
so in F1 generation when they are crossed SSbb X Ssbb, it will give rise to ------
The genotypes after F1 generation are SSbb, and Ssbb .
The genotypic ratio will be 1:1.
And the Phenotypic ratio will be 1 as it will produce all offsprings which are salmon eating and bicycle riding.
Q 8 ) If two individuals taken from F1 generation from Q7 of different genotypes and crossed to create F2 generation, what would be the Phenotypic and Genotypic ratio of F2 generation?
Answer- Phenotypic ratio- 1, that is all gamete will be salmon eating and bicycle riding
Genotypic ratio will be 1:1 .
Explanation- The two individuals taken from F1 generation are SSbb and Ssbb
SSbb will give rise to one type of gemete it is Sb.
Ssbb will give rise to two types of gametes they are Sb and sb.
When SSbb crossed with Ssbb They will give rise to
In F2 generation also the phenotypic ratio will be 1 or 100% offsprings will be Salmon eating and bicycle riding.
The Genotypic ratio will be 1:1 that is half will have heterotypic genome for salmon eating and half will be pure breed that is homozygous for salmon eating.
Sb sb Sb SSbb Ssbb Sb SSbb SsbbRelated Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.