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2. In guinea pigs, black coat color (W) is dominant to white coat color (w). Castle and Phillips (1909) transplanted an ovary from a black guinea pig into a white female whose ovaries had been removed. They then mated this white female with a white male. All the offspring from the mating were black in color.

a. Explain the results of this cross.

b. What is the genotype of the offspring from this cross?

c. What, if anything, does this experiment indicate about the validity of the pangenesis and germ-plasm theories?

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Jean Keeling
Jean KeelingLv2
28 Sep 2019

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Related questions

As in many animals albino coat color is a recessive trait in guinea pigs. Researchers removed the ovaries from an albino female guinea pig and then transplanted ovaries from a true breeding black guinea pig they then mated this albino female ( with the transplanted ovaries) the albino female produced 3 offspring. what were their coat color.

For each problem I need to know the following plus whateverspecifics the problem requests:

Key: (Which symbol stands for which allele) รขย€ย“ Use the sameletter for a gene using a capital to designate dominant and lowercase to show recessive.

Parental genotypes

Possible gametes for each parent

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1. In guinea pigs black coat color is dominant to brown coatcolor. A black guinea pig (from a long line of black guinea pigs)is bred to a brown guinea. If one of these offspring is then bredto a different brown guinea pig, what are the expected genotypesand phenotypes of their offspring?

2. In pea plants tall stems are dominant to short stems andpurple flowers are dominant to white flowers. A true breeding plantwith tall stems and white flowers is crossed with a true breedingplant having short stems and purple flowers. The offspring fromthis cross are grown up and allowed to interbreed. What are theexpected genotypes and phenotypes of their offspring?

3. In dogs, black is dominant to golden. You have a blackLabrador retriever you would like to stand at stud, but first youwant to know if it is homozygous black or heterozygous. You make atestcross to determine this. What are the expected genotypes andphenotypes if your dog is heterozygous? If it is homozygous?

4. Color-blindness is X-linked in humans. A color-blind manmarries a woman whose father was color-blind. What are the expectedgenotypes and phenotypes of their children?

The normal cloven-footed condition in swine is produced by thehomozygous rececessive genotype mm. A mule-footed condition isproduced by the dominant genotype M-. White coat color is governedby the dominant allele of another locus B and black by itsrecessive allele b. A white mule-footed sow (female) is mated to ablack, cloven-footed boar (male) and produces several litters.Among 26 offspring produced by this mating, all were found to bewhite with mule feet.

a) What is the most probable genotype of the sow?

b)The next litter produced 8 white, mule-footed offspring and onewhite clove-footed pig. Now, what is the most probable genotype ofthe sow?

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