Question

You decide to designate the alleles of the four loci as either additive (contributing to fruit segment number and represented by a superscript "+") or non-additive (not contributing to fruit segment number and represented by a superscript "0"). Using this convention, choose the correct genotype for the two pure lines and the F1, and indicate how many additive alleles each genotype has.

Answer 1

Answer:

The correct genotype of the  two pure lines and the F1 is:

A⁺A⁺B⁰B⁰C⁰C⁰D⁰D⁰   and A⁰A⁰B⁺B⁺C⁺C⁺D⁺D⁺

The number of additive alleles on each genotype are two and six respectively.

Explanation:

Locus( plural form . loci) are fixed point on a chromosome in which genes are located. These genes are specific genetic material or genotype.

Now;

If we decide to designate the allele of the four loci into either additive (⁺) or non-additive(⁰); we have the following :

Let's the allele of the four loci to be

A⁺/A⁰, B⁺/B⁰, C⁺/C⁰ and D⁺/D⁰

However, from the diagram below; we deduce that the correct genotype for the two pure lines and the F1 is as follows:

A⁺A⁺B⁰B⁰C⁰C⁰D⁰D⁰   and A⁰A⁰B⁺B⁺C⁺C⁺D⁺D⁺ and the number of additive alleles on each genotype are two and six respectively.

The cross between both F1 traits will yield an heterozygous individual for the offspring. i.e A⁺A⁰B⁺B⁰C⁺C⁰D⁺D⁰ with only four additive allele