Duroc Jersey pigs are typically red, but a sandy variation is also seen. When two different varieties of true-breeding sandy pigs were crossed to each other, they produced F1 offspring that were red. When these F1 offspring were crossed to each other, they produced red, sandy, and white pigs in a 9:6:1 ratio. Explain this pattern of inheritance in terms of number of genes, and any allele or gene interactions.

mouse lemurs are small mammals that inhabit the forests of madagascar. Researchers discovered an unusual spotted fur coloration pattern in mouse lemers in a remote region in the Tsaratanana. Reserserve in northern Madagaskar. A spotted female mpouse lemer was crossed with a solid male mouse lemer. The F1 progeny consisted of 50% solid female mouse lerners and 50% spotted male mouse lemer. What is the most likely mode of inheritance for the fur coloration pattern in mouse lemers? somatic inheritance autosomal inheritance x-linked inherintance Y-linked inheritance

Assume green pea pods are dominant over yellow pea pods, and assume  smooth seed coats are dominant over rough seed coats.

Pigeons display a high color variety, here we try to understand the genetic basis of mixed red & black stippling of the feathers (kitey) and their genetic relation to black and red feather color. We conducted the following crosses: Cross Offspring kitey x kitey 16 kitey 5 black 3 red kitey x black 6 kitey 7 black red x kitey 18 red 9 kitey 6 black   Have a look at the cross results and develop a hypothesis to explain the inheritance of kitey, black and red feather color in pigeons (Hint: assume that 2 loci are involved and some type of epistasis occurs) QUESTION: 1. provide hypothesis                     2.  provide the hypothetical genotypes for each crossing

A scientist is investigating the inheritance of two autosomal recessive genes in rat, ear length (long is dominant to short) and fur color (gray is dominant to white). The table below provides the number of observed off-spring for each phenotype, when heterozygous rats are crossed.  What are the expected values for each phenotype? Phenotype Observed Expected Long, gray 189   Long, white 56   Short, gray 74   Short, white 23   Total 342

The coat colour of some dogs is an example of an epistatic interaction. The common alleles are black (B) and brown (b). There is a separate gene on a separate chromosome that influences coat colour; it prevents colour formation and causes a white coat. L = prevents color formation and causes a white coatl = allows colour formation to occur.If a white dog heterozygous for both traits is crossed with a black dog that is heterozygous for the color gene,  which of the following represents the phenotypes of the offspring? Select one: