Question

The questions asks Suppose that pigs can either have hairless or hairy skin, and that this trait is determined by a single gene. a hairy male is mated to 3 different femailes. from this information given below answer the questions:

pig A is hairless and so is the piglet she produces
Pig B is hairy and hern piglet has a hairless coat
Pig C is hairless and her piglet is hairy
a) which allele is domiannt explain
b) what are the genotypes of each adult

Answer 1

IN MOST CASES A CHARCTER IS CONTROLLED BY TWO FORMS OF AN ALLELE A DOMINANT ALLELE AND A RECESSIVE ALLELE. DOMINANAT ALLELE IS THE ALLELE WHICH WHEN PRESENT MASKS THE EXPRESSION OF RECESSIVE  ALLELE. PHENOTYPE  OF THE RECESSIVE ALLELE IS EXPRESSED ONLY IN CASE OF HOMOZYGOUS RECESSIVE CONDITION.IN HETEROZYGOUS CONDITION AND HOMOZYGOUS DOMINANT CONDITION , DOMINANT PHENOTYPE WILL BE EXPRESSED.

SUPPOSE IN THIS CASE HAIRED PIG IS DOMINANT OVER HAIRLESS PIG.

LET'S GIVE H FOR PRESENCE OF HAIR AND h FOR HAIRLESS.

IF THE PIG IS HAIRED THEN IT WILL BE HH OR Hh .

HAIRLESS PIG IS hh.

SO HERE THE MALE PIG IS EITHER HH OR Hh

IT IS MATED TO THREE DIFFERENT FEMALES.

PIG A IS HAIRLESS THAT IS IT HAS GENOTYPE hh

CROSSING MALE PIG WITH PIG A :

IF MALE PIG IS HH IF IT IS CROSSED WITH hh THE FOUR PROGENIES WILL BE :

HH - HAIRED

Hh - HAIRED

HH - HAIRED

Hh- HAIRED.

ALL ARE HAIRED IN THE QUESTION IT IS GIVEN THAT THE PROGENY IS HAIRLESS SO WE CAN UNDERSTAND THAT THE GENOTYPE OF MALE PIG IS Hh

WHEN MALE Hh IS CROSSED WITH FEMALE hh THE PROGENIES WILL BE:

Hh-HAIRED

Hh- HAIRED

hh-HAIRLESS

hh- HAIRLESS.

SO WE CAN CLEARLY UNDERSTAND THAT GENOTYPE OF MALE PARENT IS Hh.

GENOTYPE OF PIG A IS hh

IN SECOND CASE PIG B IS HAIRY AND THE PIGLET IS HAIRLESS SO THE PIG B MUST  BE IN HETEROZYGOUS CONDITION.THAT IS Hh.

MALE PIG Hh CROSSING WITH PIG B Hh THE GENOTYPES OF THE PROGENIES ARE:

HH , Hh , Hh AND hh

HERE hh IS HAIRLESS.

IN THIRD CASE PIG C IS HAIRLESS AND THE PIGLET IS HAIRY SO THE GENOTYPE OF PIG C MUST BE hh

THE PROGENIES WHEN MALE Hh IS CROSSED WITH FEMALE hh ARE; Hh , Hh , hh and hh .

HERE Hh IS HAIRED THAT IS HALF OF THE PROGENIES ARE HAIRED .

QUEATION.A - ALLELE FOR HAIR IS DOMINANT OVER ALLELE FOR HAIRLESS.

QUESTION B: GENOTYPE OF MALE PIG - Hh

GENOTYPE OF FEMALE PIG A- hh

GENOTYPE OF FEMALE PIG B - Hh

GENOTYPE OF PIG C - hh