8)In cats, short hair is dominant over long hair: the gene is autosomal. Another

Question

8)In cats, short hair is dominant over long hair: the gene is autosomal. Another gene, B1, ch is sexlinked,produces yellow coat color, its allele B2 produces black coat color; and the e heterozygous combination B1/B2 produces tortoise shell coat color. If a long haired black male is mated with a t ortoise shell female heterozy gous for short hair, what are the genotypes of the kittens produced in the F1? If the F1 cats are allowed to interbreed freely, what are the chances of obtaining a long-haired yellow male? 9)Two recessive genes in Drosophilia (b and vg) produce black body and vestigial wings respectively. When wildty one chromosome and the rcessive genes on the homologous chromosome. Testcrossing the female Fl produced flies are testcrossed the F1 all have the dominant genes on 1930 wildtype 412 black 1888 black and vestigial 370 vestigial (a) Calculate the distance between b and vg (b) Another recessive gene en lies between loci of b and vg producing cinnabar eye color. When wildtype flies are 664 wildtype 68 vestigial 4 black, vestigial 8 cinnabar testcrossed the F1 are all trihybrid. Testcrossing the F1 females produced 652 black, cinnabar, vestigial 70 black 72 black, cinnabar 1 cinnabar, vestigial (d) do the b-vg distances coincide between the two (c) Calculate the map distances experiments? Explain 10)Consider the genetics of the ABO blood groups. A man of blood gropu B is being sued by a woman of blood group A for paternity. The woman's child is blood group O. (a) is this man the father of this child? Explain. (b) If this man actually is the father of this child, specify the genotypes of both parents. (c) If it was impossible for this group n to be the father of a type O child, regardless of the mother's genotype, specify his genotype. (d) If a man was blood group AB, could he be the father of a group O child?

Explanation / Answer

Answer to Question-8:

Let,

's' denotes short hair (dominant character)

'S' denotes long hair (rescessive character)

Ss denotes short hair

SS denotes long hair

B1 denotes yellow coat colour

B2 denotes black coat colour

B1B2 denotes tortoise shell coat

According to the question, genotype of the parents be:

Male = SS-B2B2

Female = Ss-B1B2

F1 generation = SS-B2B2 X Ss-B1B2

Now, the second part of the question emphasises that F1 generation cats can interbreed FREELY to produce long haired and yellow males.

[Note that, in order to produce yellow coat coloured cat, the mating should be made between tortoise shell coat cats, so that their genes can contribute for B1 allele which is responsible for the yellow coat colour. So, for selecting the parents for interbreeding, coloumn-1 and column-2 from the above table are considered]

So, genotype of the parents is:

Male = SS-B1B2

Female = Ss-B1B2

Hence, from the above 2 bold marked genotype will contribute for the long hair yellow coat coloured cats.

Probability (or chance) = 2/16 = 1/8

gametes SB1 SB2 sB1 sB2 SB2 SS-B1B2 SS-B2B2 Ss-B1B2 Ss-B2B22 SB2 SS-B1B2 SS-B2B2 Ss-B1B2 Ss-B2B2 SB2 SS-B1B2 SS-B2B2 Ss-B1B2 Ss-B2B2 SB2 SS-B1B2 SS-B2B2 Ss-B1B2 Ss-B2B2

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