In some dogs, long hair (L) is dominat over short hair (l), and wavy hair (W) is dominant over straight hair(w).
Draw a cross between a dog that is homozygous for long hair and straight hair with a dog that is homozygous for short hair and wavy hair. What would the genotype and phenotypes be?
Since each is homozygous for both traits, LLww mates with llWW.
Each partner has gametes with only Lw and lW. That should help you answer the questions.
L l
W LW Wl
w Lw lw
To determine the genotype and phenotypes of the offspring from the cross between a dog that is homozygous for long hair and straight hair (LLww) with a dog that is homozygous for short hair and wavy hair (llWW), we can use a Punnett square.
First, let's assign the letters L and l to represent the genes for hair length, and W and w to represent the genes for hair texture.
The alleles for the long hair gene are LL (homozygous dominant), and for the short hair gene, ll (homozygous recessive). Similarly, WW represents the homozygous dominant wavy hair gene, while ww represents the homozygous recessive straight hair gene.
Now, let's create the Punnett square:
L L
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w | LLw LLw
w | LLw LLw
From the Punnett square, we can see that all the offspring will have the genotype LLww, meaning they will have long hair and straight hair. Therefore, the genotype of all the offspring will be LLww.
For the phenotypes, we can observe that both long hair (L) and straight hair (w) are recessive traits. However, since the parent with long hair is homozygous dominant (LL) and the parent with straight hair is homozygous recessive (ww), all the offspring will inherit the dominant long hair trait and will have long hair. Similarly, since the parent with straight hair is homozygous dominant (ww) and the parent with wavy hair is homozygous dominant (WW), all the offspring will inherit the dominant straight hair trait and will have straight hair.
Therefore, the phenotype of all the offspring will be long hair and straight hair.