contestada

If
a pure-breeding (homozygous) black (dominant), long-haired
(recessive) cat is mated to a pure-breeding Siamese, short-haired
cat, and one of their male offspring is mated to one of their
female offspring, what is the chance of producing a Siamese
colored, short-haired kitten?

Respuesta :

Oseni

Answer:

The chance is 1/16

Explanation:

Let the color allele be represented by B.

Let the length of hair be represented by L.

Pure breeding black = BB (dominant)

Pure breeding long-hair = ll (recessive)

Pure breeding siamese = bb

Pure breeding short-hair = LL

Pure breeding black, long-hair = BB ll

Pure breeding siamese, short-haired = bb LL

    BB ll   x   bb LL

        F1 offspring = 100% BbLl

Crossing two of the F1 offspring:

        Bb Ll   x   Bb Ll

F2 offspring = 1 BBLL, 2 BBLl, 2 BbLL, 4 BbLl, 1 BBll, 2 Bbll, 1 bbLL, 2 bbLl, 1 bbll (see the aattched image)

Recall that: siamese color = bb and short-hair = LL

The proportion of bbLL genotype in the F2 offspring is 1/16.

The chance of producing a siamese colored, short-haired kitten is 1/16

Ver imagen Oseni
marianaegarciaperedo

Assume that these genes assort independently, there is no interact between them, and express complete dominance, the chance of producing a Siamese  colored, short-haired kitten is 3/16.

------------------

Available data:

Two diallelic genes. One codes for color and the other one for hair length.

Color Gene

  • B dominant allele that codes for black
  • b recessive allele that codes for siamese

Hair length

  • S dominant allele that codes for short
  • s recessive allele that codes for long

We will assume that these genes assort independently, they do not interact with each other, and express complete dominance.

1st Cross: a black long-haired cat with a Siamese, short-haired  cat

Parentals) BBss   x   bbSS

F1) 100% BbSs

2nd Cross: F1 male with female

Parentals)      BbSs        x         BbSs

Gametes) BS, Bs, bS, bs        BS, Bs, bS, bs

Punnett square)     BS       Bs       bS        bs

                    BS    BBSS   BBSs  BbSS    BbSs

                    Bs     BBSs   BBss   BbSs    Bbss

                    bS     BbSS   BbSs  bbSS    bbSs

                    bs      BbSs   Bbss   bbSs    bbss

F1) Phenotypes

  • 9/16 Black and short-haired cats, B-S-
  • 3/16  Black and long-haired cat, B-ss
  • 3/16  Siamese and short-haired cat, bbS-
  • 1/16   Siamese and long-haired cat, bbss

Note: the symbol - represents either a dominant or recessive allele

The probability of getting a siamese cat with short hair, bbS-, is 3/16.

-----------------------------------

Related link: https://brainly.com/question/10747731

Otras preguntas