During first cleavage, the metaphase plate is closer to the posterior, & fertilized egg is divided into two cells:

one having the anterior PARs (PAR-6 and PAR-3)

one having the posterior PARs (PAR-2 and PAR-1)

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lethal allele

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Multiple Alleles

Presence of more than two alleles at a locus in a group of diploid individuals

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PLUMAGE PATTERNS IN DUCKS

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Compound heterozygote 

An individual with two different recessive alleles at a locus that result in a recessive phenotype. 

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Reciprocal crosses

Pair of crosses in which the phenotypes of the male and female parents are reversed

 

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Genomic imprinting 

Differential expression of a gene that depends on the sex of the parent that transmitted the gene.