a.
To determine:
The mode of inheritance of signed and purple.
Introduction:
Genotypic is the genetic constitution of an individual organism, “Drosophila melanogaster”. The drosophila is a genus of flies, belonging to the family of “drosophilidae”, and phylum “Arthropoda”. It is also known by the name of fruit fly.
a.
Explanation of Solution
When homozygous flies singed and purple and homozygous flies for normal bristle and eye color are crossed
In cross I is
“
Cross II: When female, singed bristles, purple eyes crossed with male, normal bristles, red eyes then
504 female, normal bristles, red eyes and 498 male, singed bristles, red eyes.
“227 female, normal bristles, red eyes
223 female, singed bristles, red eyes
225 male, normal bristles, red eyes
225 male, singed bristles, red eyes
78 female, normal bristles, purple eyes
76 female, singed bristles, purple eyes
74 male, normal bristles, purple eyes
72 male, singed bristles, purple eyes”
In cross I,
In cross I,
b.
To determine:
The genotype of parent and offspring in the P,
Introduction:
Genotypic is the genetic constitution of an individual organism, “Drosophila melanogaster”. The drosophila is a genus of flies, belonging to the family of “drosophilidae”, and phylum “Arthropoda”. It also known by the name of fruit fly.
b.
Explanation of Solution
Pictorial representation:
Fig 1. Showing cross I,
Fig 1: genotype of
Fig 2: Showing cross II,
Fig 2: genotype of
To determine the genotype of cross I and II, first assume the symbol for the genes.
For bristles: this X-linked trait so dominant allele will be
For color of eyes: this is autosomal mode of inheritance, so its dominant allele p, will be normal red eye color a recessive allele p will be purple eye color.
In cross I, P generation of males with homozygous allele for singed bristles (
337 female, normal bristles, red eyes:
113 female, normal bristles, purple eyes:
168 male, normal bristles, red eyes:
170 male, singed bristles, red eyes:
56 male, normal bristles, purple eyes:
58 male, singed bristles, purple eyes:
In cross II, P generation of males with homozygous allele for normal bristles (
227 female, normal bristles, red eyes:
223 female singed bristles, red eyes:
225 male, normal bristles, red eyes:
225 male, singed bristles, red eyes:
78 female, normal bristles, purple eyes:
76 female singed bristles, purple eyes:
74 male, normal bristles, purple eyes:
72 male, singed bristles, purple eyes:
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Chapter 4 Solutions
Solutions and Problem-Solving Manual to Accompany Genetics: A Conceptual Approach
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