QUESTION 2 Complementary gene interactions occur when a pair of genes work together to create phenotypes for a single trait. This is caused by dominant alleles from one heterozygous loci masking other alleles, normally resulting in only two phenotypes. Incorrect term: Correct term: QUESTION 3 Epistasis occurs when the alleles from one gene mask the genotype of another gene's alleles, resulting in fewer than the expected four phenotype classes. Incorrect term: Correct term: QUESTION 4 Genetic redundancy is when a pair of genes can work together and often only require multiple dominant alleles from either loci to create a single phenotype. Incorrect term: Correct term:
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The term 'epistasis' refers to a situation in which two independent genes both have alleles with incomplete dominance. two genes share a single allele. a single gene has more than two alleles. the genotype at one locus affects the phenotype observed at a different locus. QUESTION 9 For two independently assorting genes in a species of plant, without any epistasis: One gene controls flower color, with a red allele (CR) and a white allele (CW) showing incomplete dominance (the heterozygote is pink) The other gene controls leaf shape, with a round allele (LR) and a deeply lobed allele (LL) showing incomplete dominance (the heterozygote is shallow-lobed) In a dihybrid cross CRCW LRLW x CRCW LRLW , how many different phenotypes are possible in the F2 offspring? 16 9 6 12
Sri K.
The difference between dominance and gene interaction is that: Gene interaction only occurs in one sex while dominance occurs in both sexes. Dominance results from interaction between allelic genes, while gene interaction involves many non-allelic genes. Dominance is synonymous with gene interaction. In dominance, there are only 2 possible phenotypes, while in gene interaction, there are many possible phenotypes. Dominance presents all characteristics except the following: - It is the result of the interaction of alleles in the same locus. - It depends on which level of phenotype is examined. - It makes recessive alleles less frequent in the population. - It does not alter the way in which genes are inherited.
John N.
Match the following terms with their descriptions: When alleles for a trait separate during reproduction, offspring inherits one randomly When alleles inherited for trait 1 is not correlated with allele inherited trait 2 When breeding two pure breeding generations, one allele may mask the effect of allele 2 in the next generation When neither allele is dominant or recessive, both are expressed equally When the heterozygote shows a third, blended phenotype
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