Biology 1001A Lecture Notes - Lecture 10: Pigment, Zygosity, Melanocortin 1 Receptor

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greymink18

18 Dec 2015

School

Western University

Department

Biology

Course

Biology 1001A

Professor

Beth Mac Dougall- Shackleton

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Document Summary

Blonde hair caused by recessive gene will die out in 200 years. Different coat colours have become common in three pig enclosures. Both colours are likely to still be present in main herd. You can develop pure-breeding herds simply by selective breeding stock on basis of colour. This indicates that the diff in colour b/w black vs. brown pigs due to diff in genes they inherit from their parents. If experimental populations are breeding pure, then mating b/w a pure-bred brown pig and black pig will produce offspring of a single colour. In mendel"s model, traits like coat color are determined by factors that we now call genes. Each individual carries two copies of the gene for any given trait. Copies of the gene for a given trait, like coat color, may come in different versions. Because each pig carries two copies of the coat color gene, there are three possible combinations of alleles.

Related Questions

In need of assistance. Please help answer the following.

1) Pure-breeding yellow guinea pigs crossedwith pure-breeding white guinea pigs produce only cream-coloredoffspring. This pattern indicates incomplete dominance. Rough hairis found to be dominant to smooth hair. Give the F1 and F2genotypic and phenotypic ratios of a cross of a smooth white guineapig with a homozygous rough yellow guinea pig.

2) A breeder of cattle has a herd of white cowsand a roan bull. Hair color in this breed is controlled by anincomplete dominant gene. The two homozygous forms are either redor white, and the heterozygous is roan. Answer the followingquestions please

What color calves are expected and in whatproportion?

Outline a procedure to develop an all-redherd.

3) In horses, black coat color is influenced bythe dominant allele (B), and chestnut coat color is influenced bythe recessive allele (b). Trotting gait is due to a dominant gene(T), pacing gait to the recessive allele (t). If a homozygous blacktrotter is crossed with a chestnut pacer:

What will be the appearance of the F1 and F2generations?

Which phenotype will be the most common?

Which genotype will be the most common?

Which of the potential offspring will be certain tobreed true?

4) In garden peas, one pair of alleles controlsthe height of the plant and a second pair of alleles controlsflower color. The allele for tall (D) is dominant to the allele fordwarf (d), and the allele for purple (P) is dominant for the allelefor white (p). A tall purple crossed with a tall purple produces Â¾tall purple and Â¼ tall white. What is the genotype of the parents?

5) Three alleles control the ABO blood types.I^A and I^B are codominant genes, so thecombination of I^AI^B produces the AB bloodtype. The third allele I^ois recessive to the other twoalleles. Indicate which of these parents could produce the givenchild and submit your response to the instructor.

A X AB produce B child.

A X O produce A child.

A X B produce O child.

A X AB produce O child.

A X AB produce B child.

B X B produce O child.

AB X AB produce A child.

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Biology 1001A Lecture Notes - Lecture 10: Pigment, Zygosity, Melanocortin 1 Receptor

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