Question

g Consider a cross between female flies homozygous for brown bodies and red eyes and male flies homozygous for ebony bodies and sepia eyes. Give the genotypes and the possible gametes of each set of parents.

Answer 1

Answer:

Female gametes AB, male gametes ab

Offspring-heterozygous genotype AaBb

Explanation:

If we name the gene  for the body color with A and gene for the eye color with B  and if the brown body is dominan over ebony body, while red eyes are dominant over sepia eyes, than the genotypes  of the parents would be: female- AABB, male-aabb

P: AABB  x  aabb

Female gametes AB, male gametes ab

F1: AaBb all of the offspring would be heterozygous.

Answer 2

Genes for eye and body color are autosomal, not linked, with no interaction, and expressing complete dominance. Female Genotype SSEE / Gametes: SE, SE, SE, SE. Male Genotype ssee / Gametes: se, se, se, se.

--------------------------------------

Available data:

• female flies ⇒h0m0zyg0us for brown bodies and red eyes
• male flies ⇒ h0m0zyg0us for ebony bodies and sepia eyes

We will assume autosomal genes, not linked, with no interaction, and complete dominance.

→  Autosomal genes

Gene for eyes color

• The dominant allele expresses red color, S
• Recessive allele expresses sepia color, s

Gene for body color

• The dominant allele expresses brown color, E
• Recessive allele expresses ebony color, e

→  Not linked

They assort independently from each other.

→  Complete dominance

When the dominant allele completely masks the recessive allele, we talk about complete dominance.

This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant phenotype.

The dominant allele is hiding the expression of the recessive allele. Many genes show complete dominance.

→  No interaction

The presence of one of the genes, in either their dominant or recessive forms, does not affects the expression of the other gene.

Now, let us analyze the problem

Cross)  female  x  male

Parentals)         SSEE            x           ssee

Gametes)  SE, SE, SE, SE           se, se, se, se

F1) 100%  heter0zyg0us for both traits,  SsEe .

     100% of the progeny will express red eyes and brown bodies.

---------------------------

Related link: https://brainly.com/question/14592987?referrer=searchResults