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Questions and Answers
What defines a homozygous genotype in plants?
What defines a homozygous genotype in plants?
- A dominant allele paired with a recessive allele.
- Having three alleles of a gene.
- Having two different alleles of a gene.
- Having two identical alleles of a gene. (correct)
In the F₂ generation of pea plants, what genotype do all F₁ plants share?
In the F₂ generation of pea plants, what genotype do all F₁ plants share?
- RrYy (correct)
- rrYY
- RRYY
- RRYy
Which term describes the observable characteristics of an organism?
Which term describes the observable characteristics of an organism?
- Genotype
- Dominance
- Phenotype (correct)
- Allele
What is the expected phenotype in a case of incomplete dominance?
What is the expected phenotype in a case of incomplete dominance?
How would you characterize a heterozygous plant?
How would you characterize a heterozygous plant?
Flashcards
Phenotype?
Phenotype?
The observable traits of an organism, such as flower color, leaf shape, etc. - what you actually see.
Genotype?
Genotype?
The genetic makeup of an organism, represented by letters, like 'TT' or 'Rr'.
Homozygous?
Homozygous?
Having two identical copies of a gene.
Heterozygous?
Heterozygous?
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Incomplete Dominance?
Incomplete Dominance?
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Study Notes
Phenotype and Genotype
- Phenotype: The observable characteristics or traits of an organism.
- Genotype: The genetic makeup of an organism. This refers to the actual genes/alleles.
Homozygous and Heterozygous
- Homozygous: Having two identical alleles for a particular gene (e.g., TT or tt).
- Heterozygous: Having two different alleles for a particular gene (e.g., Tt).
F₂ Generation
- All F₁ generation offspring have the genotype RrYy.
Phenotype Example in the F₂ Generation
- The phenotype of the F₂ generation is "round yellow".
- "Round" and "yellow" are the characteristics of the plant's traits.
Incomplete Dominance
- In incomplete dominance, the phenotype of a heterozygote is intermediate (mixed) between the phenotypes of the two homozygotes.
- A dominant homozygous plant and heterozygous plant are indistinguishable in phenotype.
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