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ACTIVITY: BLOOD TYPES, MULTIPLE ALLELES, CO-DOMINANCE & INCOMPLETE DOMINANCE

Last updated over 5 years ago
27 questions
PART A – Genes and Blood Types
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1. Complete the following table by writing the blood type Genotype AND Phenotype in the gaps below:

2. Blood typing is sometimes used in custody cases in court. Two men both claim to be the father of the child. The child has Type A blood and the mother type B blood. Man 1 has type O blood, while man 2 has type AB blood.
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2. a) Which man is definitely not the father of the child? Show workings to explain (see below)

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2. a) workings

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2. b) Does this test prove that the other man is the father? Explain

3. A man has type A blood. He and his wife have three children, whose blood types are A, o and B
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3. a) Determine the GENOTYPES of the parents and the children

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3. b) What is the BLOOD TYPE of the children’s mother?

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3. c) Is it possible that the next child could have type AB blood? Show working below

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3. c) workings

4. A woman with type O blood has a child with type O blood. She is fairly certain that the father is the second of her two husbands.
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4. a) His blood type is A, is it possible that he is the father? Why?

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4. b) If a husband #2's mother has type A blood and his father type AB. is it possible that he is the father? Show workings below

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4. b) workings

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4. c) If both of his parents have types AB, could he be the father? Show workings below

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4. c) workings

PART B – Incomplete Dominance
After several matings of tan-coloured birds, a breeder noted the following average offspring numbers:

24 white, 26 brown and 53 tan birds.

There are only two genes that control feather colour in birds – they are WW- White and BB - Brown with the intermediate or mixed colour being BW - Tan
1) Work out a cross that would produce the following results:
50% of all offspring are brown
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1) workings

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1) Parent Phenotypes - a)___________________ x b)___________________

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1) Parent Genotypes - c)__________________ x d)_____________________

2) Work out a cross that would produce the following results:
100% of all offspring are tan
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2) workings

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2) Parent Phenotypes - a)___________________ x b)___________________

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2) Parent Genotypes - c)__________________ x d)_____________________

3) Work out a cross that would produce the following results:
50% of all offspring are tan
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3) workings

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3) Parent Phenotypes - a)___________________ x b)___________________

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3) Parent Genotypes - c)__________________ x d)_____________________

4) Work out a cross that would produce the following results:
25% of all offspring are white
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4) workings

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4) Parent Phenotypes - a)___________________ x b)___________________

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4) Parent Genotypes - c)__________________ x d)_____________________

PART C – Codominance
1) In the short-horn cattle breed coat colour is inherited and there are only two alleles (CW – White, CR – Red).

Roan cattle contain both red hair and white hair – giving their coat a mottled ‘roan’ appearance.
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1) Complete the following two crosses:

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2) Suggest how the farmer who owns these cattle could control the breeding so that the herd ultimately consisted of red cattle only