Match each parental monohybrid cross of pea plants with its expected offspring genotypic o… — JAMB UTME

Match each parental monohybrid cross of pea plants with its expected offspring genotypic or phenotypic ratio according to Mendel's First Law.

Homozygous dominant × Homozygous recessive ( $TT \times tt$ )100% Heterozygous ( $Tt$ )
Heterozygous × Heterozygous ( $Tt \times Tt$ )3 : 1 Phenotypic ratio
Heterozygous × Homozygous recessive ( $Tt \times tt$ )1 : 1 Genotypic/Phenotypic ratio

Homozygous dominant × Homozygous recessive matches 100% Heterozygous (

Tt

); Heterozygous × Heterozygous matches 3 : 1 Phenotypic ratio; Heterozygous × Homozygous recessive matches 1 : 1 Genotypic/Phenotypic ratio.

Crossing homozygous dominant (

TT

) with homozygous recessive (

tt

) produces uniform

Tt

offspring. Crossing two heterozygotes (

Tt \times Tt

) yields the classic Mendelian F2 phenotypic ratio of 3 dominant to 1 recessive. Crossing a heterozygote (

Tt

) with a homozygous recessive (

tt

) generates equal proportions (1:1) of heterozygous dominant and homozygous recessive phenotypes.

Analyze gamete formation for each monohybrid cross based on Mendel's Law of Segregation.

For

TT \times tt

, gametes are

T

and

t

, producing

Tt

. For

Tt \times Tt

, gametes are

T, t

and

T, t

, producing

1TT : 2Tt : 1tt

(3 dominant : 1 recessive). For

Tt \times tt

, gametes are

T, t

and

t

, producing

1Tt : 1tt

Alleles segregate during gamete formation so that each gamete carries only one allele for a trait.

Mendel's First Law and Monohybrid Ratios

Question