Question

two chromosomes are pictured at left; each chromosome is depicting one gene: flower color (p,p) and stem length: (t,t). using these two traits, write down all the possible allele combinations among flower color and stem length: in each of the 4 circles:
which of mendel’s laws do the illustrations at left best depict?

Explanation:

Step1: Identify allele segregation principle

For a dihybrid genotype $PpTt$, during gamete formation, alleles of each gene segregate independently, so each gamete gets one allele from each gene.

Step2: List all allele combinations

Combine each allele for flower color (P, p) with each allele for stem length (T, t):

1. $P$ + $T$ = $PT$
2. $P$ + $t$ = $Pt$
3. $p$ + $T$ = $pT$
4. $p$ + $t$ = $pt$

Step3: Identify Mendel's law

The independent segregation of alleles for different traits (flower color and stem length) to form unique gamete combinations is described by Mendel's Law of Independent Assortment.

Answer:

1. The 4 allele combinations for the circles (from top to bottom): $PT$, $Pt$, $pT$, $pt$
2. The illustrations best depict Mendel's Law of Independent Assortment (which states that alleles of different genes segregate independently of one another during gamete formation, creating all possible allele combinations in gametes).