Question

Imagine that a certain animal's fur length is determined by three genes. The genotype for long fur is AABBCC and aabbcc for short fur. A cross between long fur and short fur produces F1 offspring with medium length fur AaBbCc. Draw a Punnett square that shows a cross between two F1 offspring.

Answer 1

A Punnett square can be used to predict the possible outcomes of a genetic cross. In this case, the Punnett square shows the possible genotypes for fur length in the F2 generation.

Step-by-step explanation:

In this Punnett square, the mating of two F1 individuals (AaBbCc x AaBbCc) demonstrates the potential genetic combinations for their offspring's fur length. Each letter represents an allele for a specific gene influencing fur length.

| ABc | AbC | aBC | aBc | Abc | abC | AbC | abc

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

AbC | ABBCC | ABBCc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc

Abc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc | ABBcc

aBC | AaBBCC | AaBBCc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

aBc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

abC | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

abc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

AbC | AaBBCC | AaBBCc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

abc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc | AaBBcc

The square reveals the variety of genotypes and phenotypes that can arise, ranging from long fur (dominant alleles) to short fur (recessive alleles). The F1 generation carries a combination of alleles inherited from both parents, resulting in medium-length fur.

This illustrates the principles of Mendelian genetics, emphasizing the assortment and segregation of alleles during reproduction, contributing to the diversity of traits observed in the offspring.

Answer 2

The Punnet's square showing a cross between two F1 offspring is as shown below.

The cross involves three traits. The genotype of the F1 offspring is AaBbCc. From this genotype, the gametes that would be formed during meiosis would be as follows:

• ABC
• ABc
• AbC
• Abc
• aBC
• aBc
• abC
• abc

In other words, 8 possible gametes are formed. These gametes are then lined up in an 8x8 Punnet's square. The resulting cross from Punnet's square is in the attached image.

Overall, 64 offspring are formed.