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anyanavicka [17]
3 years ago
10

How do the methods of scientists lead to knowledge?

Biology
1 answer:
motikmotik3 years ago
5 0
The process of the scientific method involves making conjectures (hypotheses), deriving predictions from them as logical consequences, and then carrying out experiments or empirical observations based on those predictions. A hypothesis is a conjecture, based on knowledge obtained while seeking answers to the question.
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In rats, the genes B and D control fur color as follows: B_dd rats have black fur, bbD_ have yellow fur, B_D_ have brown fur, an
lorasvet [3.4K]

Answer:

Phenotypes:

  •    9/16 Brown-fured rats, B-D-
  •    3/16 Black-fured rats, B-dd
  •    3/16 Yellow-fured rats, bbD-
  •    1/16 Cream-fured rats, bbdd

Explanation:

<u>Available data:</u>

  • the genes B and D control fur color
  • B_dd rats have black fur,
  • bbD_ have yellow fur,
  • B_D_ have brown fur,
  • bbdd rats have cream-colored fur

1st cross: pure-breeding brown rat with a pure-breeding cream-colored rat

Parentals) BBDD   x   bbdd

Gametes) BD, BD, BD, BD

                bd, bd, bd, bd

F1) 100% BbDd

2nd Cross: F1 individuals interbreed

Parentals) BbDd    x    BbDd

Gametes) BD, Bd, bD, bd

                BD, Bd, bD, bd

Punnett square)    BD         Bd          bD           bd

                 BD     BBDD    BBDd     BbDD     BbDd

                 Bd     BBDd     BBdd     BbDd      Bbdd

                 bD     BbDD     BbDd    bbDD      bbDd

                 bd     BbDd      Bbdd     bbDd      bbdd

F2) Genotypes:

  •     1/16 BBDD
  •     2/16 BBDd
  •     1/16 BBdd
  •     2/16 BbDD
  •     4/16 BbDd
  •     2/16 Bbdd
  •     1/16 bbDD
  •     2/16 bbDd
  •     1/16 bbdd

   Phenotypes:

  •    9/16 Brown-fured rats, B-D-
  •    3/16 Black-fured rats, B-dd
  •    3/16 Yellow-fured rats, bbD-
  •    1/16 Cream-fured rats, bbdd
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