Summer Squash  The fruit colours of summer squash may be white, yellow, or green. The determination of the phenotypic colour is an example of dominant epistasis.  White fruit is produced by a dominant epistatic allele (W). At another location on the chromosome, the allele for yellow fruit (F) is dominant over the allele for green fruit (f). The presence of the white allele hides the effect of the yellow or green alleles.  If a WwFf x WwFf  cross occurs,  predict the gametes  predict the offspring that will occur by creating a Punnett square, and  provide the white : yellow : green hybrid phenotypic ratio.

Homework Unanswered In Drosophila, the genes for ebony body and sepia eyes are on the same chromosome. If s+se+e X s+se+e dihybrids are crossed, what is the maximum number of genotype combinations that can occur? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. b 4 8 d 16

I. In the fruit fly Drosophila melanogaster, tan body color (B) is dominant to black (b), and dark red eyes (E) is dominant to bright orange (e). A black fly, heterozygous for eye color (Fly #1) is crossed to an orange eyed fly, heterozygous for body color (Fly #2). What are... Genotypes of the parents? Gametes from each parent? Ratios of gametes from each parent? Complete the following Punnett square. Indicate gamete genotypes from each parent and all offspring genotypes. Fly #1 What proportion of offspring are... Tan & dark red? Tan & orange? Black & dark red? Black & orange? Probability (P) of Aa Bb Dd = P (Aa) A. B. I II. What is the probability that this pair of parents will produce the indicated offspring? Aa Bb DD x aa Bb Dd Aa Bb Dd. Punnett squares for each trait can help with this! IV Mode of inheritance = C. I II BIO 340 ACTIVITY #3: HYBRID CROSSES, PROBABILITY & PEDIGREES Name (Last, First) III. For each of these three pedigrees, determine the likely mode of inheritance and…

Two different genes are located on the same chromosome in rabbits. A particular female rabbit is heterozygous for alleles of both genes, with alleles arranged as shown in the diagram to the right. Scientists know that the two genes are on the same chromosome, but do not know their exact relative positions, as indicated by the dashed line. Suppose this female mates with a male rabbit in which the same r. chromosome pair looks like this: Which of the following statements best describes the likelihood that this pair of rabbits would have offspring with a chromosome pair that looks like this: * O More likely if the two genes are not very close together on the chromosome E-i-e R- O Not likely, because the R and e alleles are not on the same chromosome in either parent O More likely if the two genes are very close together on the chromosome O Very likely, because the random assortment of chromosomes during cell division to make sperm or eggs allows for the mixing of all alleles