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Genetics

The expected phenotype of F2 generation would be 75% tall plants and 25% short plants. In F2 generation 25% of plants would be tall but would be homozygous for their trait of tallness. Another 50% of plants would also be tall but would be heterozygous for their trait of tallness while the remaining 25% of would be short and would be recessive for their trait.
Dihybrid cross: A dihybrid cross is a cross between two individuals that involves two pairs of contrasting characteristics. If two plants that are pure bred (homozygous) for two contrasting traits for example one plant that is tall and produce yellow seeds (both dominant traits) and the other plant that is short and produces green seeds (both recessive traits) are crossed with other, than the F1 generation produced would be all heterozygous for both characteristics. But only dominant trait would appear in the phenotype of F1 generation and all plants of this generation would appear tall and would produce yellow seeds. ...
is sow that is homozygous for pricked ears and unspotted skin than the F1 generation produced will all have pricked ear and spotted skin, as these two traits are dominant. The genotype of F1 generation would be PpSs. (Key: P= pricked ears, p=lop ears, S=spotted skin, s-unspotted skin). However the phenotype and genotype of F2 generation produced is shown as follows
Heterozygous F1 generation Pricked ear spotted skin mating
*
Different
gametes
produced
byF1
generation



The Punnett Square below shows the F2 generation produced by random
mating


PS Ps pS ps
PS
PPSS PPSs PpSS PpSs
Ps
PPSs PPss PpSs Ppss
pS
PpSS PpSs ppSS ppSs
ps
PpSs Ppss ppSs ppss

The Punnett Square shows the possible genotype results of F2 generation. The genotype results explain the phenotype results such that nine offspring are pricked ear and spotted, three offspring are pricked ear and unspotted, three other offspring are unpricked (lop) ear and spotted while one offspring is lop eared and unspotted

2.a)Homogametic sex: It refers to that gender of specie that has both sex chromosomes identical. For instance in humans females have two X sex chromosome thus females in humans are referred to as homogametic sex.
But in birds males of two identical Z chromosomes so in birds, males are homogametic sex
Heterogametic sex: It refers to that gender of a specie that has ...Show more

Summary

1 a.) Monohybrid cross: A monohybrid cross is a breeding experiment between parental generation organisms that differ in one trait. Monohybrid inheritance involves inheritance of a single trait. A monohybrid cross between two pure breeding plants, one that is a tall plant (dominant trait) and the other that is a short plant (recessive trait) is expected to produce an F1 (first) generation of plants that are al tall because the allele of tallness would dominant to shortness in the offspring produced…
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