Question
6. A Cyclops that is resistant to pesticides and has smooth antennae is crossed with one that is heterozygous for both traits. Show the genotypes of the parents. [ ( RRSS ) times ( RrSs ) ] 7. Set up a punnett square for the cross. & & & & & & & & & & & &
Solution
4.7
(178 Votes)
Walter
Veteran ยท Tutor for 9 years
Answer
### The genotypes of the parents are
and
. The completed Punnett square is:
Explanation
## Step 1: Understanding the Genotypes of the Parents### The problem states that one Cyclops is resistant to pesticides and has smooth antennae, with a genotype of
. This means it is homozygous dominant for both traits. The other Cyclops is heterozygous for both traits, with a genotype of
.## Step 2: Determining Possible Gametes### For the
parent, the only possible gamete is
because it is homozygous for both traits.### For the
parent, the possible gametes are
and
, as each allele can independently assort.## Step 3: Setting Up the Punnett Square### A Punnett square is used to predict the genotypes of offspring from a genetic cross. Since one parent can produce only one type of gamete (
), and the other can produce four types (
), the Punnett square will have one row for the
parent's gamete and four columns for the
parent's gametes.
### Each cell in the table represents the combination of alleles from the gametes of each parent.