JOURNAL : EOCT BIOLOGY QUESTIONS 1. In Mendel’s experiment with a single trait, the trait that disappeared in the first generation and reappeared in the next generation is called the a. Homozygous trait b. Dominant trait c. Recessive trait d. Heterozygous trait 2. In fruit flies, the gray body color is (G) is dominant to the ebony body color (g). What is the genotypic ratio of the offspring of a heterozygous gray female and an ebony male? a. 25% Gg, 75% gg b. 50%Gg, 50% gg c. 75% gray, 25% ebony
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JOURNAL : EOCT BIOLOGY QUESTIONS 1.In Mendel’s experiment with a single trait, the trait that disappeared in the first generation and reappeared in the.
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JOURNAL : EOCT BIOLOGY QUESTIONS
1. In Mendel’s experiment with a single trait, the trait that disappeared in the first generation and reappeared in the next generation is called the
a. Homozygous traitb. Dominant traitc. Recessive traitd. Heterozygous trait
2. In fruit flies, the gray body color is (G) is dominant to the ebony body color (g). What is the genotypic ratio of the offspring of a heterozygous gray female and an ebony male?
When is a trait said to display incomplete dominance?
When the heterozygote has a phenotype intermediate between the phenotypes of two homozygotes
What is codominance?
The phenotype of the heterozygote is not intermediate between the phenotypes of the homozygotes; rather , the heterozygote expresses both homozygote phenotypes simultaneously
In horses, gray horses (GG) are codominant to white horses (WW). The heterozygous horses(GW) is an appaloosa horse (a white horse with gray spots on the rump and loins). Cross a white horse with an appaloosa horse.
Genotypic ratios:
Phenotypic ratios:
What is a test cross?
A cross that is made in which one individual of unknown genotype is crossed with another individual with a homozygous recessive genotype
Ex. TTx tt = all tall (Tt) Recessive will not appear Tt x tt = 50% of offspring will show recessive trait (tt), 50% heterozygous (Tt)
What is a backcross?
When a cross made between an F1 genotype and either of the parental genotypes
Ex. Tt x tt or Tt x TT
Law of Dominance:
The trait that is observed when two alleles are present
Ex. Pp - purple
Law of Segregation
Alleles segregate (separate) during the formation of gametes and one allele goes into each gamete
Which law was formulated as a result of Mendel’s dihybrid
crosses?
LAW OF INDEPENDENT ASSORTMENT:
Alleles at different loci separate independently of one another