In a trait with strict dominant/recessive alleles what phenotype will be express
ID: 187424 • Letter: I
Question
In a trait with strict dominant/recessive alleles what phenotype will be expressed by individuals with the heterozygous genotype?
A. the dominant phenotype
B. both phenotypes will be cancelled out and neither will be expressed
C. a phenotype half way between dominant and recessive
D. the recessive phenotype
2:Which term means an organism that has two copies of the same allele for a trait? For example AA or bb.
A. heterozygous
B. triploid
C. epigenetic
D. homozygous
3:In genetics this term means the observable expression of the genes for a trait.
A. diploid
B. genotype
C. haploid
D. phenotype
4:This term in genetics means the combination of alleles for a specific trait.
A. genotype
B. phenotype
C. haploid
D. diploid
5:What do we call multiple versions of the same gene? For example a gene encoding yellow peas and a gene encoding green peas.
A. nucleouli
B. alleles
C. quarks
D. skeins
6:In Mendel’s original experiment crossing different true-breeding lines, the F1 generation always exhibited which phenotype?
A. all were dominant
B. all were recessive
C. dominant to recessive at 3:1 ratio
D. dominant to recessive at 1:1 ratio
7:When Mendel crossed his two truebreeding lines of flower color what outcome did he observe?
A. 100% of the F1 generation expressed the dominant phenotype
B. 100% of the F1 generation expressed the recessive phenotype
C. 75% of the F1 generation expressed the recessive phenotype
D. 75% of the F1 generation expressed the dominant phenotype
8:You are studying a population of fish and you notice that the size of the dorsal fin in these fish shows a normal distribution (normal curve). Based on your knowledge of genetics what is your prediction for the genetics of this trait?
A. It is encoded by one gene with complete dominance between two alleles
B. It is encoded by more than one gene
C. It is encoded by one gene with codominance between alleles
D. It is not encoded by genetics at all
9:Traits such as height or skin color that exhibit a phenotypic distribution of a normal curve don’t follow Mendel’s rules because they are…
A. the result of incomplete dominance at one gene
B. not genetic, but environmental in origin
C. encoded by more than one gene
D. the result of codominance at one gene
10:What is it called when a heterozygote for a trait exhibits a phenotype half-way between the dominant and recessive phenotype, such as a red and a white parent having pink offspring?
A. linkage
B. epistasis
C. incomplete dominance
D. complete dominance
Explanation / Answer
In a trait with strict dominant/recessive alleles what phenotype will be expressed by individuals with the heterozygous genotype?
The answer is A. the dominant phenotype. Becuase dominant character can be expressed in both homozygous and heterozygous conditions where as the receseive condition will be expressed only in homozygous condition only.
2:Which term means an organism that has two copies of the same allele for a trait? For example AA or bb.
The answer is D. Homozygous. Homo means same. If the organism has same allele configuration it is reffered as homozygous.
3:In genetics this term means the observable expression of the genes for a trait.
The answer is D. phenotype - An observable characterstics of an organism which is reffered as phenoytpe.
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