consider two plants wuth the genotypes Rrtt and rrTt where red color (R) is dominant over white (r) and being tall (T) is dominant over being short (t). complete the punnett squares to determine the possible ganetes each parent could produce.
using the punnet square (16 squares)
diagram a cross between the plants, this is a dihybrid cross.
To determine the possible gametes each parent could produce, we need to look at the genotypes of both plants. One plant has the genotype Rrtt, and the other has the genotype rrTt.
To determine the possible gametes for each parent, we separate the genotypes into their individual alleles. Let's start with the plant with the genotype Rrtt:
Genotype: Rrtt
Separating the alleles: Rr and tt
Possible gametes: The plant can produce two types of gametes - R and t.
Now let's move on to the plant with the genotype rrTt:
Genotype: rrTt
Separating the alleles: rr and Tt
Possible gametes: The plant can produce two types of gametes - r and T.
Now that we have determined the possible gametes for each parent, we can construct a Punnett square for a dihybrid cross. A dihybrid cross involves two traits being considered simultaneously. In this case, it would be the color (Rr or rr) and height (Tt or tt).
To create a Punnett square for a dihybrid cross, we list the possible gametes for each parent on the sides of the square and combine them in all possible ways. Since we have already determined the possible gametes, we can proceed to fill out the Punnett square:
Parent 1 gametes: R, t (Rrtt)
Parent 2 gametes: r, T (rrTt)
The Punnett square will have 16 squares since there are 4 possible combinations for each trait:
r T
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| | | | |
R | RrTt | RrTt | RrTt | RrTt |
| | | | |
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| | | | |
t | Rrtt | Rrtt | Rrtt | Rrtt |
| | | | |
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In this Punnett square, each square represents a possible combination of the alleles from the two parents. These combinations can then be used to determine the genotypes and phenotypes of the offspring.