. A couple with the following blood types: the man has type AB and the woman has type B, discover their child has type O blood. Is it possible that one of these ‘parents’ may not actually be the genetic parent of this child? If so, which one, and how do you know? 7. In horses coat color shows incomplete dominance: the alleles are chestnut color (Hc) and cremello (Hcr); heterozygous individuals have the phenotype palamino. What are the predicted phenotypes from a cross between a palamino and cremello colored horses? What are the genotypes?

6. The man is the father of the child with O blood group since it does not contribute O allele to the child and mother have BO alleles. The child will receive one O from mother since O is recessive allele it will be expressed in homozygous condition which is not possible with this cross.

7 The phenotype is half palamino and half cremello horses are produced . The genotype is HcHcr : HcrHcr (1:1 ratio)

Explanation:

Data given:

blood group of man = AB (genotype is AB)

blood Group of woman = B (genotype can be BB or BO

Child is O type = why

The cross shows

       A           B

B     AB      AB

O     A0         BO

it is known that each parent contributes one of the alleles to their child in ABO blood system.

The father with AB group is able to pass either A or B allele to the child

Mother with BO could either pass B or O allele to the child. But since 0 is the recessive trait both parents must pass on O allele for the child to be O blood type.

Hence man with AB is not the biological father of the child.

7. data given:

Coat colour in horses depict phenomenon of codominance.

chestnut colour is Hc

cremello colour horse genotype = HcrHcr

plamino colour Hc Hcr

cross shows:

       Hcr       Hcr

Hc   HcHcr   HcHcr            2:2  cremello:plamino

Hcr   HcrHcr HcrHcr            genotype = 1:1 ratio

                                              HcHcr : HcrHcr

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

because the light is a great source of energy for the plants to survive. (i hope this )