Biology, 29.09.2019 14:30 ravensenpai423

Assignment: using punnett squares exploration

first cross: show a cross between a homozygous red bull (rr) and a heterozygous red cow (rr).

genotypic ratio:
phenotypic ratio:

second cross: show a cross between a heterozygous red bull (rr) and a heterozygous red cow (rr).

genotypic ratio:
phenotypic ratio:

third cross: show a cross between a homozygous white bull (rr) and a homozygous white cow (rr).

genotypic ratio:
phenotypic ratio:

Answers: 2

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Answers

Answer from: tonya3498

Case I

Genotypic Ratio – RR: Rr = 2: 2 = 1: 1

Phenotypic Ratio – All the offspring are red in color as R is dominant over r

Case II

Genotypic Ratio – RR: Rr: rr = 1: 2: 1

Phenotypic Ratio – All RR and Rr are red in color while rr is of different color, thus the phenotypic ratio is Red offspring : White offspring = 3:1

Case III

Genotypic Ratio – All offspring’s are of genotpe rr

Phenotypic Ratio – All offsprings are of white color

Explanation:

Case I – Homozygous red bull (RR) and a heterozygous red cow (Rr)

(R ) is dominant over ( r )

The punnet square for the cross between the Homozygous red bull (RR) and heterozygous red cow (Rr) is as follows -

RRRRR

rRrRr

Genotypic Ratio – RR: Rr = 2: 2 = 1: 1

Phenotypic Ratio – All the offspring are red in color as R is dominant over r

Case II - heterozygous red bull (Rr) and a heterozygous red cow (Rr)

The punnet square for the cross between the heterozygous red bull (Rr) and a heterozygous red cow (Rr) is as follows -

RRRRr

rRrrr

Genotypic Ratio – RR: Rr: rr = 1: 2: 1

Phenotypic Ratio – All RR and Rr are red in color while rr is of different color, thus the phenotypic ratio is Red offspring : White offspring = 3:1

Case III - homozygous white bull (rr) and a homozygous white cow (rr)

The punnet square for the cross between the homozygous white bull (rr) and a homozygous white cow (rr) is as follows -

rrrrr

Genotypic Ratio – All offspring’s are of genotpe rr

Phenotypic Ratio – All offsprings are of white color

Answer from: Quest

The zone your looking for is the intertidal zone.

Answer from: Quest

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet / 380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.

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Assignment: using punnett squares exploration

first cross: show a cross between a homo...

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