In snapdragon plants (*Antirrhinum majus*), flower color inheritance exhibits incomplete d… — JAMB UTME

In snapdragon plants (*Antirrhinum majus*), flower color inheritance exhibits incomplete dominance between the red allele ( $C^R$ ) and white allele ( $C^W$ ). A plant breeder crosses a pink-flowered snapdragon ( $C^R C^W$ ) with a red-flowered snapdragon ( $C^R C^R$ ). What percentage of the resulting offspring is predicted to have pink flowers?

A
25%
50%Cevap
C
75%
D
100%

Cevap

50% of the offspring are predicted to have pink flowers.

In incomplete dominance, heterozygous individuals (

C^R C^W

) express an intermediate pink phenotype. A cross between a pink plant (

C^R C^W

) and a red plant (

C^R C^R

) produces equal numbers of

C^R C^R

(red) and

C^R C^W

(pink) progeny, resulting in a 50% probability for pink flowers.

Adım Adım Çözüm

Determine the parental genotypes

Pink parent genotype is

C^R C^W

; Red parent genotype is

C^R C^R

In incomplete dominance, the intermediate phenotype (pink) is heterozygous, while the red phenotype is homozygous dominant.

Formulate gametes for each parent

Pink parent produces 50%

C^R

and 50%

C^W

gametes. Red parent produces 100%

C^R

gametes.

Mendel's Law of Segregation dictates that allele pairs separate during gamete formation.

Determine offspring genotypes and phenotypes

Offspring genotypes are 50%

C^R C^R

(Red) and 50%

C^R C^W

(Pink).

Combining

C^R

from the red parent with

C^R

C^W

from the pink parent gives a 1:1 ratio of red to pink flowers.

Anahtar Kavram

Incomplete Dominance Phenotypic Ratios

Tahmini Süre:1m 0s

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Cevap

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