Genetics Please check if the work done is correct and Hint: Some traits use comb

Question

Genetics
Please check if the work done is correct and
Hint: Some traits use combinations of letters to indicate alleles. In the ex the dominant allele. The recessive allele is hd Therefore, a person heterozygous for Huntington disease has the genotype HD hd (not Hh Ddi sentence again to yourself) ample below, . (Read that last 5. In humans, the Huntington disease allele (HD) is dominant to the normal allele (ad), Cystic fibro sis (e) is recessive to the normal allele (C). A man with the genotype HD hd Cs has a child with a woman of genotype hd hd Ce From the given information in #5 above, what gamete genotypes are present tc Among the sperm? (from the man)Hh enolupe Among the eggs? (from the woman) hC he Use these egg and sperm genotypes to set up the Punnett square below. Then determine the phenotypic frequencies of the next generation (the possible children of this man and this woman). You may not need the entire grid to solve the problem hC he What proportion of offspring would be expected to have: Huntington discase, but not cystic fibrosis?H 3: Huntingtofh No Huntingion disease, but with eystic fibrosis?t6 128 AND cystic fibrosis? No Huntington discase and no cystic fibrosis?

Explanation / Answer

The calculations and answers are correct.

And you are not getting the 9:3:3:1 ratio for this question because that ratio is characteristic to a dihybrid cross which is heterozygous to both the alleles. But in this case, one of the loci in female is homozygous (hh) for the alleles.

Hope this helps :)

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