23. In rabbits, short hair is due to a dominant allele, S, long hair to its rece

Question

23. In rabbits, short hair is due to a dominant allele, S, long hair to its recessive allele, s. Black hair is due to a dominant allele, B, and white hair to its recessive allele, b. When two rabbits were crossed, they produced 2,518 short-haired, black and 817 long- haired, black offspring. What are the probable genotypes of the parents? 24. In humans, the condition for normal blood clotting dominates hemophilia. Both alleles are sex- linked to the X chromosome. Two parents produced daughters who are all carriers and sons who are all normal. What are the probable genotypes of the parents? 25. In humans, deafness is due to a homozygous condition of either or both recessive alle les d and e. Both dominant alleles D and E are needed for normal hearing. Two deaf people marry and produce offspring who all have normal hearing. What are the probable genotypes of the children and parents?

Explanation / Answer

Short hair = S

Long hair=s

Black hair= B

White hair=b

Short haired, black=2518

Long haired black=817

ratio= 2518/817= 3:1

The genotypes of the parents

SsBB x SsBB

Gametes= SB, sB

SB

sB

SB

SSBB (Short haired, black)

SsBB (Short haired, black)

sB

SsBB (Short haired, black)

ssBB (Long haired black)

(24)

Genotype of parents

XX (female) x XhY (Male)

All females are carriers

XhX, XhX, XY, XY

SB

sB

SB

SSBB (Short haired, black)

SsBB (Short haired, black)

sB

SsBB (Short haired, black)

ssBB (Long haired black)

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