the curled ears of the american curl cat are caused by an autosomal dominant allele. What are the chances of a heterozygous female and a homozygous recessive male producing offspring with curled ears?
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To determine the chances of producing offspring with curled ears between a heterozygous female and a homozygous recessive male in the case of the American Curl Cat, we need to understand the principles of Mendelian inheritance.
Let's denote the allele for curled ears as "C" (dominant) and the allele for normal ears as "c" (recessive). The genotypes of the parents are as follows:
Heterozygous female: Cc
Homozygous recessive male: cc
When these two parents mate, there are four possible combinations of alleles that can be passed on to the offspring: two possibilities from the mother and two from the father.
The possible combinations are as follows:
1. Female parent (Cc) passes on the allele "C"
2. Male parent (cc) passes on the allele "c"
This combination results in a heterozygous offspring with curled ears (Cc).
3. Female parent (Cc) passes on the allele "C"
4. Male parent (cc) passes on the allele "c"
This combination also results in a heterozygous offspring with curled ears (Cc).
Therefore, in both cases, the offspring will have curled ears. The chances of producing offspring with curled ears in this scenario is 100%.
It's worth noting that since the allele for curled ears is autosomal dominant, offspring only require one copy of the allele to exhibit the trait.
To determine the chances of a specific genetic outcome, we can use Punnett squares to analyze the possible combinations of alleles from the parents. In this case, we have a heterozygous female (Cc) and a homozygous recessive male (cc). The "C" allele represents the dominant allele for curled ears, while the "c" allele represents the recessive allele.
To create a Punnett square, we list the possible gametes from each parent along the top and side of a square and fill in the boxes with the resulting offspring combinations.
For the heterozygous female (Cc), the possible gametes will be C and c.
For the homozygous recessive male (cc), the only possible gametes will be c.
Now, let's create the Punnett square:
| C | c |
--------------------------
c | Cc | cc |
--------------------------
Reading the Punnett square, we can see that there are two possible combinations for the offspring:
1. A Cc genotype, representing a heterozygous individual with curled ears.
2. A cc genotype, representing a homozygous recessive individual with straight ears.
Based on this Punnett square, there is a 50% chance of producing offspring with curled ears (Cc genotype) and a 50% chance of producing offspring with straight ears (cc genotype).