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3 years ago

Explain the difference between a monohybrid cross and a dihybrid cross, and give an example of each.

1 answer:

4 0

Monohybrid crosses only look at one genotype. Whereas dihybrid crosses look at two genotypes.
An example of a monohybrid cross would be AA x aa, where A represents the dominant allele, and its phenotype is the colour red, and a represents the recessive allele, and its phenotype is the colour white.
An example of a dihybrid cross would be SSYY x SsYy, where the letter S represents the size, dominant phenotype is large, recessive is small, and Y represents the colour, dominant phenotype is yellow, recessive is green.

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3 years ago

A population of wild-flowers was scored for flower color. There were 302 blue (BB) plants, 1857 violet (BR) plants and 811 red (

Paul [167]

Answer:

frequency of the blue (B) allele $= 0.4142$

frequency of the red (R) allele $= 0.5858$

The number of blue plants expected is $509.652$

The number of red plants expected is $1019.304$

The anticipated number of violet plants is $1441.341$

Calculated chi square value

$= 84.5320 + 42.5688 + 119.8692\\= 246.97$

Explanation:

Frequency of blue allele is

Frequency of blue allele is equal to sum of frequency of BB and half of frequency of BR

$\frac{302}{2970} + \frac{1}{2} \frac{1857}{2970} \\= 0.1016 + 0.3126\\= 0.4142$

Frequency of other allele

$1- 0.4142\\= 0.5858$

Chi Square test

See the attached file

The number of blue plants expected is $509.652$

The number of red plants expected is $1019.304$

The anticipated number of violet plants is $1441.341$

Calculated chi square value

$= 84.5320 + 42.5688 + 119.8692\\= 246.97$

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