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Goats can either be polled or horned. The pulled, or no horn, trait (P) is dominant to the horned (p) trait. Another trait in goats are wattles, which are hair covered structures on their necks. Even though most goats do not have wattles, having wattles (W) is dominant to not having wattles (w). A breeder crosses a polled, wattled male goat with a polled, wattled female goat. Some of the offspring have horns and no wattles. Perform a cross of the parental genotypes to find the phenotypic ratios of the offspring.

Sagot :

Oseni

Answer:

Pulled and wattled = 9/16

Pulled and no wattle = 3/16

horned and wattled = 3/16

horned and no wattle = 1/16

Explanation:

Pulled = P, Horned = p

Wattled = W, no wattle = w

Polled, wattle goats = P_W_

Since they produced offspring with horns and no wattles (ppww), it means both parents have the recessive allele for each trait. Hence, they are both heterozygotes with PpWw as genotypes.

       PpWw    x    PpWw

Genotypes ratio of the offspring:

P_W_ - 9/16

P_ww - 3/16

ppW_ - 3/16

ppww - 1/16

Phenotype ratio of the offspring:

Pulled and wattled = 9/16

Pulled and no wattle = 3/16

horned and wattled = 3/16

horned and no wattle = 1/16

(See the attached image for the Punnet's square)

View image Oseni

Some alleles of a gene are dominant to others masking the effect this other alleles.

The polled, or no horn, trait (P) is dominant to the horned (p) trait.

Having wattles (W) is dominant to not having wattles (w).

A breeder crosses a polled, wattled male goat with a polled, wattled female goat.

The phenotypic and genotypic ratios would be

  • Polled and wattled = P_W_      =  9/16
  • Polled with no wattle = P_ww =  3/16
  • horned and wattled = ppW_     =  3/16
  • horned with no wattle = pwpw =  1/16

Parent genotype --- polled, wattled male and female goat -- P_W_

As the cross produced offspring with horns and no wattles (ppww), it shows both parents have the recessive allele for each trait.

Hence, they are both heterozygotes with PpWw for the traits.

Parent genotypes:  PpWw             x      PpWw

                             PW Pw pW pw         PW Pw pW pw

                PW         Pw          pW         pw

    PW    PPWW    PPWw     PpWW   PpWw

    Pw     PPWw    PPww      PpWw   Ppww

    pW    PpWW    PpWw      ppWW  ppWw

    pw   PpWw       Ppww     ppWw  ppww  

Learn more:https://brainly.com/question/23796622

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