Linked Genes While working with a type of beetle that is normally smooth and large, you discover two mutations that lead to the recessive phenotypes, bumpy and small, respectively. For the body type (i.e., smooth or bumpy) use S or s to designate the alleles. For the size (i.e., large or small) use L or l to designate the alleles. You cross two true-breeding parents to get all F1 beetles that are large and smooth. You cross the F1 to true-breeding small, bumpy beetles and get: 228 large and smooth, 19 small and smooth, 16 large and bumpy, 237 small and bumpy. What were the genotypes and phenotypes of the two parental beetles (P generation)? Calculate the distance in cM between the S and L genes, using the information from the cross above. Now draw a linear genetic map of these two genes. Another gene for beetle body color, gene W, is found to be 5 cM from the S gene. Indicate the TWO places where this gene may fall in relation to the other two genes on the linear genetic map you have drawn. What method could help you figure out exactly where this gene lies on this map? (Insert your map below for credit.)
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
Linked Genes
While working with a type of beetle that is normally smooth and large, you discover two mutations that lead to the recessive
For the body type (i.e., smooth or bumpy) use S or s to designate the alleles.
For the size (i.e., large or small) use L or l to designate the alleles.
- You cross two true-breeding parents to get all F1 beetles that are large and smooth. You cross the F1 to true-breeding small, bumpy beetles and get: 228 large and smooth, 19 small and smooth, 16 large and bumpy, 237 small and bumpy. What were the genotypes and phenotypes of the two parental beetles (P generation)?
- Calculate the distance in cM between the S and L genes, using the information from the cross above.
- Now draw a linear genetic map of these two genes. Another gene for beetle body color, gene W, is found to be 5 cM from the S gene. Indicate the TWO places where this gene may fall in relation to the other two genes on the linear genetic map you have drawn. What method could help you figure out exactly where this gene lies on this map? (Insert your map below for credit.)
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