In a species of fish the dorsal fin can be blackspotted or b

In a species of fish, the dorsal fin can be black-spotted or beige. A fish breeder conducted the following crosses with pure-breeding fish stocks and observed the following results for the behavior of the color-pattern gene. A. Define gene symbols for this gene. Which trait is dominant? B. Explain the mode of inheritance of this gene. C. Give the genotypes of each parent in Cross I and II.

cross I black spotted female and beige male

cross II beige female and black spotted male

A. gene symbols are X^b , X^B, B is dominant allele. b recessive allele

b. it is sex-linked inheritance. specifically X-linked dominant inheritance. B and b alleles are found on X chromosomes.

		beige male
	F/M	X^b	Y
black female	X^B	X^bX^B	X^BY
		black	black

		X^B	Y
	X^b	X^bX^B	X^bY
	X^B	X^BX^B	X^BY

black females	X^bX^B	X^BX^B
black males	X^BY
beige males	X^bY

In a species of fish, the dorsal fin can be black-spotted or beige. A fish breeder conducted the following crosses with pure-breeding fish stocks and observed

In a species of fish the dorsal fin can be blackspotted or b

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