Genetic Assignment #1
Name:
Due Date:
Part A: Knowledge and Understanding
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1. Define true – breeding. What is a hybrid? [2]
2. Distinguish between monohybrid and dihybrid crosses. What is a test cross, and why is it
useful in genetic analysis? [4]
3. For Labrador retrievers, black fur (B) is dominant over yellow fur (b).
a) What would be the genotype of a homozygous black dog and a heterozygous black dog? [2]
b) Could the heterozygous black dog have the same genotype as a dog with yellow fur? Explain.
[2]
4. For guinea pigs, black fur condition (B) is dominant over white (b). Show the results of a across
between two heterozygous parents using a Punnett Square. [8]
5. In cats, long tails (L) and no tails (N) are co –dominant. The heterozygous condition results in
short tails. Using a Punnett Square, give the ratios of genotypes and phenotypes for the
offspring of a cross between two short-tailed cats. [8]
6. In guinea pigs, black fur colour is dominant over white. Short hair is dominant over long hair.
A guinea pig that homozygous for white and for short hair is mated with a guinea pig that is
homozygous for black and for ling hair.
a) Indicate the phenotypes (s) of the F1 generation. [3]
b) If two hybrids from the F1 are mated, determine the genotype and phenotype ratio of the
F2 generation. [8]
7. Fruit flies have four possible phenotypes for eye colour; the hierarchy of dominance is
represented in this order; wild type (red) (E1), apricot (E2), honey (E3), and white (E4). If a wild
eye-white male is mated with an apricot-honey female, what will be the F1 generation’s
genotypes and phenotypes be? Be sure to create a chart of hierarchy to determine the
genotypes of each parent. [8]
8. In snapdragons, the alleles for flower colour display incomplete dominance. Red (RR), White
(WW), and Pink (RW).
a) A red flowered plant is crossed with a white flower plant. What are the predicted
genotypes and phenotypes f the offspring? Explain your answer. [4]
b) An offspring produced from the mating in part (a) is crossed with a white coloured
snapdragon. What are the predicted phenotypes and genotypes of the offspring? Include
the phenotypic ratio of the offspring. [6]
Part B: Science and Technology and Communication
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On your own, research a Canadian researcher (either alive or deceased) who has made a significant
contribution to genetic researching. In your research you should indicate the name of the geneticist
and what contribution(s) they have made to the world of genetics. In this portion you can discuss any
experiments, theories, or innovations that this scientist has been responsible for. Once the
contribution of your researched scientist has been discussed in terms of its specifics, talk about why
the contribution is important to the field of genetics. In other words, why is this contribution relevant
and why should we care about it? Discuss its relevance to genetics, biology and the world as a whole.
Mark Breakdown for Part B:
2 Marks: Introductory paragraph discussing the scientist specifically. Include name, school graduated
from, years of research, age, and anything you think is interesting about the scientist.
4 Marks: Discussion of the contribution. Include the contribution itself and how it came about
(experiments, techniques, prior knowledge, and research the scientist had done, etc.)
4 Marks: Discussion of the importance and relevance of the contribution. Include why the
contribution is important to both the fields of genetics and biology as a whole. Also discuss its
importance to the world as a whole and if you should care or not.