Question

*13. What characteristics of an organism would make it suitable for studies of the principles of inheritance? Can you name several organisms that have these characteristics?

*30. In guinea pigs, the allele for black fur (B) is dominant over the allele for brown (b) fur. A black guinea pig is crossed with a brown guinea pig, producing five F₁ black guinea pigs and six F₁ brown guinea pigs.

a. How many copies of the black allele (B) will be present in each cell from an F₁ black guinea pig at the following stages: G₁, G₂, metaphase of mitosis, metaphase I of meiosis, metaphase II of meiosis, and after the second cytokinesis following meiosis? Assume that no crossing over takes place.

b. How many copies of the brown allele (b) will be present in each cell from an F₁ brown guinea pig at the same stages as those listed in part a? Assume that no crossing over takes place.

*25. What is the probability of rolling one six-sided dice and obtaining the following numbers?

a. 2

b. 1 or 2

c. An even number

d. Any number but a 6

Answer 1

Answer 13:- Characteristics of an organism would make it suitable for studies of the principle of inheritance are given below........

• They grow rapidly and produced many generation with short time period.
• They have distinctive phenotype which is easy to recognize.
• They produce lage number of offsprings in small tume period.
• They have mainly fertile F1 generation.
• They have short life span and give result in that time period.

Example of organisms who full fill these criteria are given below.......

1. Pisum sativum
2. Drosophila melanogester
3. Neurospora
4. Saccharomyces cerevisiae.

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