HELP! Mendelian Genetics?
I do not get this at all can someone please explain it to me please?
I’m not asking anyone to do the questions just how to do each one, I missed the lesson that day.
Thank you:)
Medel’s law of dominance and segration are to be used
1.A
In the summer squash, white fruit colour is dominant; yellow is recessive. If a squash plant is homozygous for white is crossed with a homozygous yellow, predict the appearance of the F1 generation and the F2 generation.
1.B
If an F1 is crossed with a homozygous white indicate the possible offspring
2.A
In humans brown eyes are dominant and blue eyes are recessive. Make a Punnett square showing the possible eye colours of the children of a heterozygous, brown-eyed father and a blue-eyed mother. Give the phenotypes and genotypes ratios of the children.
2.B
Two browned eyed parents have two children with blue eyes. Give the genotypes of wasch member of the family.
3. The polled (hornless) trait in cattle is dominant ; the horned trait is recessive. Certain polled bull is mated to three cows. Cow A, which is horned, gives birth to polled calf. Cow B, also horned, produced a horned calf. Cow C, which is polled, produced a horned calf. What are the genotypes of the four parents?
4. In sheep white coat is dominant, black is recessive. Occasionally a black sheep appears in the flock. How could the farmer eliminate the gene for black from his flock?
5. Why would offspring of families with a history of diabetes mellitus ( a recessive trait on both the mother’s and father’s side be more likely to develop the disease than offspring of families in which diabetes has occured only on one parent’s side of family? Use Punnett squares in your explanation
6.An extra finger in man is rare, but due to a dominant gene. WHen one parent is normal and the other parent has an extra finger, but is heterozygous for the condition what is the probability that their first child will be normal? their second? their third?
7. Albinisn (lack of pigment) in man is caused by a recessive gene. If normal parents have an albino child, what is the probability that their next child will be normal colour?
8. Outline a possible cross to determine whether a black guinea pig is homozygous or heterozygous for the colour trait. This called a test cross, A test cross is method used to determine whether an organism that shows a dominant is pure dominant whether it is heterozygous
9. Suppose you were a cat fancier and were raising what you thought was a purebred but some of the cats had spots of white hair at their tips of their tails, while did not. How could you determine whether this trait is recessive or dominant? that only one pair of genes is affecting this trait.
