Module 6 Activity 1 Other Patterns PDF

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finding patterns ...

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Genetics Problems: Other Patterns These problems involve incomplete dominance and multiple alleles. 1. Two cats with medium-length tails have a litter which includes 6 with medium tails, 2 with long tails, and 3 with no tails. From these data, we might infer that incomplete dominance is operating here. Explain why this seems to be true and identify the genotypes of all these cats. Because there is an intermediate in between the dominate and recessive gene. Genotypes Mother: Mm

Father: Mm

Long-tailed kittens: MM

Medium-tailed kittens: Mm No-tailed Kittens mm

2. Unlike pea flower color, color of snapdragon flowers is controlled by incomplete dominance. White-flowered and red-flowered snapdragons are homozygous, while pink flowered-snapdragons are heterozygous. A nursery wants to cell seeds that only produce one color of flower. Identify the parents they would need to cross to produce seeds that will only produce one color of flower. Parents to produce only white-flowered offspring: WW Parents to produce only red-flowered offspring: RR Parents to produce only pink-flowered offspring: RW 3. A man with type AB blood marries a women with type O blood. What is the expected ratio of blood types in their children? % type O: zero

% type A: 50

% type B:50 % type AB: zero

4. A man with type A blood marries a women with type B blood. They have a child with type O blood. What are the genotypes of the man and women? What % of their children will have type AB blood? Man’s Genotype: AO %AB children: 25

Women’s Genotype: BO

5. In radishes, red and white are the pure-breeding colors and long and round are the pure-breeding shapes, while the hybrids are purple and oval. The cross of a red oval with a purple oval will produce what proportion of each of the 9 possible phenotypes? Use the table below to draw a Punnett square to help with the problem. Red-Oval Parent Purple Oval Parent

LLR r

LlR R

LlRr

LLRr

LLrr

LlRr

Llrr

LlRR

LlRr

llRR

llRr

LlRr

Llrr

llRr

llrr

LLRR

Red-Long: 1 /16

Red-Oval: 2 /16

Red-Round: 1 /16

White-Long: 1 /16

White-Oval: 2 /16

White-Round: 1 /16

Purple-Long: 2 /16

Purple-Oval: 4 /16

Purple-Round: 2 /16...