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Sagot :
Answer:
D. Autosomal recessive.
Explanation:
Available data:
- One diallelic gene codes for the phenotype Myles
- One allele expresses the wild type phenotype → like jazz music
- The other allele expresses the mutated phenotype → don´t like jazz
- Cross: Between two wild cats
- F1) Female, wild-type: 341; Male, wild-type: 369; Female, Myles: 121; Male, Myles: 123
Autosomal recessive inheritance characterizes because the mutated gene locates in one of the 22 non-sexual, somatic chromosomes. To express the phenotype, an individual must carry two copies of the mutated gene. For this reason, the recessive allele must be present in both the male/father and the female/mother.
In the exposed example, the numbers among the progeny are 341:369:121:123. These values approximate a phenotypic ratio 3:1 for females, and for males. This ratio suggests that the cross was performed between two heterozygous individuals.
Let us name the alleles M and m, dominant and recessive respectively. The cross would be like follows
Cross: wild-type male x wild-type female
Parentals) Mm XY x MmXX
Gametes) MX, MY, mX, mY MX, MX, mX, mX
Punnett Square) MX MX mX mX
MX MMXX MMXX MmXX MmXX
mX MmXX MmXX mmXX mmXX
MY MMXY MMXY MmXY MmXY
mY MmXY MmXY mmXY mmXY
F1) Whole progeny
- 12/16 = 3/4 = 75% Wild-type cats → MMXX + MmXX + MMXY + MmXY
- 4/16 = 1/4 = 25% Mutated cats → mmXX + mmXY
Females
- 6/8 = 3/4 = 75% Wild-type cats → MMXX + MmXX
- 2/8 = 1/4 = 25% Mutated cats → mmXX
Males
- 6/8 = 3/4 = 75% Wild-type cats → MMXY + MmXY
- 2/8 = 1/4 = 25% Mutated cats → mmXY
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