In goats, black fur is dominant to red fur. The gene for this trait can be described as Bb (if you forgot why this is so, go back and reread the background information at the beginning of this exercise). A homozygous black female goat (nanny) is crossed with a heterozygous male (billy). 3  Using this information, fill in Punnett square A to predict the potential genotypes of offspring that could result from this cross.     Fill input: Fill input: Fill input: Fill input: Fill input: Fill input Fill input: Fill input:  Punnet Square A   BB B Bb BB Bb B B

Two fruit flies (Drosophila melanogaster) were crossed. The cross was between a homozygous red-eyed, wingless female and a white-eyed male heterozygous for wings. Recall that red eyes (R) is dominant over white eyes (r) and is inherited on the X chromosome (sex-linked) and as such, eye colour alleles should be written as superscript. In addition, the autosomal trait wings (W) is dominant over wingless (w). 1. List the female genotype 2. List the male genotype 3. Construct a Punnett Square for this dihybrid cross on a piece of paper, to determine what the offspring of such a cross would be with respect to sex, eye colour & wings. 4. Using the information from your Punnett Square answer the following: a. What genotypes did you get (list all genotype combinations; if you have more than one of the same kind, you do NOT have to re-list it.) b. What are the phenotypic ratios of the offspring with respect to sex, eye colour and wings?

please answer all parts

43. Two pea plants are crossed. Each is heterozygous for height (T=tall, t= dwarf) and purple flowers (P = purple flowers, p=white flowers). What percentage of the offspring will be dwarf and white? phenotypic ratio Was it necessary to complete a Punnett square to answer this question? Explain.

What does a Punnett square tell you?   a.The inheritance pattern for a pair of alleles   b.The phenotype probabilities of offspring for a given cross   c.The number of offspring who will have a particular genotype for a given cross   d.The genotype probabilities of offspring for a given cross 2.What would be the most likely karyotype for somebody described as “hemizygous positive for a Y-linked trait”?   a.Y+ Y+   b.X Y+   c.X+ Y+   d.X+ Y- 3.X-linked ichthyosis is an X-linked recessive trait that manifests in part as dry, scaly skin (“ichthy-” = fish or fish like). Suppose a couple are considering having a child together. Parent A is heterozygous for the ichthyosis allele while Parent B is hemizygous negative for the ichthyosis allele. What is the probability their child would be unafflicted with ichthyosis but be a carrier of the ichthyosis-causing allele?   a.0%   b.25%   c.50%   d.75%   e.100% 4.If somebody has the phenotype of…

Spotted lanternfly females were crosses with males possessing short wings (sw) ebony body (e) and sephia (s) eyes, which are recessive traits. 1000 offspring were counted, and the results are shown in the table. below. No determination of sex was made. Using proper notation determine the linkage-genotype of the female parent. Determine the sequence of the three genes and map the distances between them. Calculate the COC and interference in the cross and describe what it means. Phenotype ++ e S SW + s + + + sw e + + + S SW e se + sw + #offspring 332 331 111 121 46 56 7 6

In tomatoes, dwarf (d) is recessive to tall (D) and opaque (light-green) leaves (op) are recessive to green leaves (Op). The loci that determine height and leaf color are linked and separated by a distance of 7 m.u. For each of the following crosses, determine the phenotypes and proportions of progeny produced.