Genetic crosses Lab

Answer the questions below. When you are finished, turn in your assignment for grading. Use complete sentences and answer each part of the assignment.

14. In a flower garden, the gardener has purple and white pansies. He notices that a new pansy has sprouted. When it finally flowers, the pansy is lavender. Explain how this happened. (5 points) This would happen in a case incomplete dominance. The white pansies nor the purple ones genes dominated making a 50/50 offspring.

4. Clear wing, Black eye, and Hairless (c, b, and h) are linked, recessive traits carried on

2. a) How does meiosis introduce genetic variation into offspring? Think about how the chromosomes line up.(1 point)

---If given traits and parents, be able to use a Punnett square or patterns to predict the probability of offspring for a given cross and express it as a fraction, percent, or ratio.---

Suppose the feather color of a bird is controlled by two alleles, D and d. The D allele results in dark feathers, while the d allele results in lighter feathers.

Once the Punnett square for Question 12 is complete, calculate the ratio of purple and yellow kernels (recall that if the dominant trait is present, it will be expressed).

Now mate a mutant F1 female fly with a mutant F1 male fly. Out of the 50 F2 progeny, what percentage of flies are wild type and what percentage are mutant

This lab had 2 exercises. Exercise 9.1 involved observing pictures of 60 F2 offspring and recording the phenotypes for 6 different traits. Exercise 9.2 required us to perform the “chi-square test” to determine whether the data we collected matches the standard Mendelian ratio.

The two recessive alleles are both on the same chromosome. Genes A and B completely follow Mendel’s principles of inheritance; genes B and C are physically connected together and never are separated from each other at any time during any cell division cycle or fertilization event. Draw below the gamete genotypes that this individual could produce.

7.) A: The genotypes are TTCC, TTCc, TtCC, and TtCc. B: The genotypes are ttCC and ttCC. C: The genotypes are TTcc and Ttcc. D: This genotype would be ttcc. E: This genotype would be TtCc. F: Such a person could produce TT, Tt, tt, CC, Cc, and cc gametes.

5. Again, set the number of offspring to the maximum of 6. Then, click the Cross button repeatedly until these parents have produced about 100 F1 offspring.

(a) Suppose skin color in a frog is determined by two alleles: B (blue) and Y (yellow). B and Y show incomplete dominance, where BY heterozygotes are

For this experiment the first step is to too Select 50 red chips and 50 yellow chips and then place them in a cup. The chips represent the gene pool of the 1st generation. The colors represent alleles. The second step is to choose without looking, pull out 20 pairs of chips. Each chip represents the allele of an individual that was able to reproduce and each pair represents an individual offspring (2nd generation) with genes inherited from each parent. Record the percentage of red and yellow 40 chips in the 2nd

Chromosomes line up in different orders (random assortment) so when they go to either new cell on cell might have dominant for one characteristic (e.g. brown eyes), recessive for another (e.g. blond hair), and dominant for a third one (e.g. can roll tongue) whereas the other created cell might be dominant, dominant dominant (brown eyes, brown hair and can roll tongue.