In sheep, black coat color completely dominates over white, and long ears incompletely dominate over earlessness, and heterozygous animals have short ears. The above traits are inherited independently. From crossing white short-eared sheep with a heterozygous black long-eared ram, 124 lambs were obtained. How many dry white lambs did you get? How many lambs have the same genotype as the father ram (theoretically)?
Let’s designate the gene that determines the development of black wool in sheep as B, then the gene for white wool will be in. Let’s designate the gene that causes the development of long ears in sheep as C, then the gene for earlessness will be c, and sheep with short ears will be written as Cc. White short-eared sheep will be written as bbСс. Such sheep produce bC and bc germ cells. A heterozygous black long-eared ram will be BbCC, the spermatozoa it produces will be BC and bC. All probable offspring of these individuals will look as follows: black long-eared lambs (ВbСС) – 25%; black short-eared lambs (BbCc) – 25%; white long-eared lambs (bbСС) – 25%; white short-eared lambs (bbCc) – 25%. There will be no deaf lambs in the offspring. 25% of lambs will have the ram father genotype (BbCC), which in numerical terms will be 31 individuals.
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