Genetics Answers

Choose the correct completion.

The correct development of the sense of smell is controlled by the action of two genes, A and M; the absence of at least one dominant allele for each of the two genes causes insensitivity to odors in the unborn child. What is the probability that the first child of the following couple will be affected by this disorder?

AaMm X AAmm

to. 0%

b. 12.5% c. 25% d. 50%

In garden peas, green pod color is dominant over yellow pods. Also, round seed shape is dominant over wrinkled seed. Cross-fertilization was done between a pea that is homozygous dominant for pod color with heterozygous round shape and another pea that is heterozygous for both pod color and seed shape. Determine the genotypic ratio and phenotypic ratio of the offspring.

 Instruction: Analyze each genetic problem. Answer what is asked for. Show complete solution.

1. A cross between a black cat and a tan cat results in a tabby A tabby cat is crossed with a tan cat.

• What is the pattern of inheritance in this example? (1 point)
• What ratio of the offspring will have tabby fur? Tan fur? Black fur? (3 points answer; 4 points Punnett square)

1. In the n the early 1940s, famed entertainer Charlie Chaplin was taken to court in a paternity case brought by his former protege, Joan Berry. Berry was 23 and Chaplin 54, and she alleged that he was the father of her newborn baby, Carol Ann. Charlie Chaplin’s blood type was already on record as type AB. The mother of the child had type A and her child had type O

• Complete a Punnett square for the possible cross of Charlie and the (4 points)
• The judge ruled in favor of the mother and ordered Charlie Chaplin to pay child support costs of the child. Was the judge correct in his decision based on blood typing evidence? Explain why or why (3 points)

Genetic cross for two grey mice where the offspring are grey,white and black

PART 1: Read and analyze the following genetic problem. Answer what is being asked. Show complete solution (Genotypes of P, Punnet Square and GR, PR). (10 points)

Criteria:

Genotypes of P = 2 pts 

Punnet Square = 4 pts 

GR, PR = 4 pts

TOTAL = 10 pts

• In garden peas, green pod color is dominant over yellow pods. Also, round seed shape is dominant over wrinkled seed. Cross-fertilization was done between a pea that is homozygous dominant for pod color with heterozygous round shape and another pea that is heterozygous for both pod color and seed shape. Determine the genotypic ratio and phenotypic ratio of the offspring.

1. A cross between a black cat and a tan cat results in a tabby A tabby cat is crossed with a tan cat.

• What is the pattern of inheritance in this example? (1 point)
• What ratio of the offspring will have tabby fur? Tan fur? Black fur? (3 points answer; 4 points Punnett square)

A cross between a blue bird and a white bird produce silver offspring. What are the genotypes of the parents? What are the genotypes of the offspring?

1. Merpeople can be found if you visit Black Lake on the grounds of Hogwarts. Tail colour in merpeople exhibits incomplete dominance. Red tails and white tails are both homozygous traits.

1. Indicate the genotypes for white tails and red tails. (2 marks)
2. What would a mermaid’s tail look like if she was heterozygous for red and white alleles? (1 mark)
3. Use a Punnett square to illustrate the cross between a merman with a white tail and a mermaid that is heterozygous for tail colour. Indicate the phenotypic ratio for their offspring. (3 marks)

A plant that produces white flowers is crossed with a plant that produces purple flowers. 
Briefly explain what Incomplete dominance and Codominance conditions are. (1)
Describe the phenotype of the heterozygous offspring if the inheritance patterns follow an (2)
Incomplete dominance.Codominance.