I am stuck on the B part of this question. Spider syndrome is a recessive diseas

Question

I am stuck on the B part of this question.

Spider syndrome is a recessive disease that causes leg deformities in sheep. In many cases, the homozygote recessive (ss) genotype is lethal. However, a heterozygote (Ss) individual can be a carrier of recessive allele and show no symptoms of the disease. In a small population of sheep the following frequencies were observed: Without taking inbreeding into account, what are the expected genotypic frequencies of the progeny of this generation of sheep? What are the expected genotypic frequencies in the progeny of a random female from this population mated to a carrier male?

Explanation / Answer

Answer B)

Since the question specifies random Female there the genotype could be " Ss " or "SS"

the propbability of PS = 0.83 and Ps = 0.17 in females

mating with a carrier male PS = 0,5 and Ps = 0.5

Therefore

SS = (0.83*0.5) = 41.5%

Ss = (0.83*0.5) + (0.5 * 0.17)= 41.5 % + 8.5% = 50 %

ss = (0.17* 0.5) = 8.5%

or if the female is SS (it can produce only S gamete)

then SS = (1*0.5) = 50%

Ss = (1*0.5) = 50%

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.