For practice, let's work with blood groups. Three alleles exist for human blood types. They were not numbered, but instead marked with the letters for A, B and O. The labeling convention is : IA, IB, and Ii. IA and IB are codominant alleles, whereas Ii is the recessive allele for type O. Humans are diploid; every individual carries only two alleles.

I think this is the complete question you were hoping to ask:

For practice, let's work with blood groups. Three alleles exist for human blood types. They were not numbered, but instead marked with the letters for A,B and O. The labelling convention is: IA, IB and Ii. IA and IB are codominant alleles, whereas Ii is the recessive type O. Humans are diploid; every individual carries only two alleles.

1.) List all possible blood group genotypes.

2.) How many kinds of homozygotes are there?

3.) How many kinds of heterozygotes are there?

4.) There are only 4 blood group phenotypes (A, B, AB and O). Based on the information given here , list the genotypes that produce each phenotype.

a.) type A  b.) type B   c.) type AB  d.) type O.

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1. All possible blood group genotypes are

  AA, AO, BB, BO, AB, OO

2. there are three kinds of homozygotes: AA, BB, OO

3. There are also three kinds of heterozygotes: AO, BO, AB

4. type A: AA, AO   type B: BB, BO  type AB: AB, type O: OO

Explanation:

The human blood group system is depicted in such a way that it is based on the presence or the absence of antigens A and B carried on the surface of the red blood cells. The pattern of inheritance of both A and B is usually in the codominant form. the blood types includes, A, B, O, AB.

1. All possible blood group genotypes are

  AA, AO, BB, BO, AB, OO

2. there are three kinds of homozygotes: AA, BB, OO

3. There are also three kinds of heterozygotes: AO, BO, AB

4. type A: AA, AO   type B: BB, BO  type AB: AB, type O: OO

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

the answer is false?