is .n guinea pigs, black coat color (B) is dominant to white (b), and rough domi

Question

is .n guinea pigs, black coat color (B) is dominant to white (b), and rough dominant to smooth (t). What are the expected genotypia following crosses: is dominant to white (b), and rough color R are the expected genotypic and phenotypic results of the a) BBRR x bbrr b) BBrr x bbRR c) Bbrr x bbRr d) BBRr x BbRr e) BbRr x BbRr 2)The presence of one of the Rh antigens on the surface of the red blood cells (Rh+) in humans is produced by a dominant gene R, Th negative cells are produced by the recessive genotype rr. Oval shaped erythrocytes (elliptocytosis) are caused by a dominant gene E, its recessive allele,e produces normal red blood cells. A man with elliptocytosis, whose mother had normally shaped erythrocytes and a homozygous positive genotype and whose father was Rh negative and heterozy gous for elliptocytosis marries a normal Rh negative woman. (a) what is the genotype of the man and the woman he marries? (b) What are Rh the ities of the offspring they can have and what ratios? (c) What is the probabil probablity of their first child being Rh negative and elliptocytotic? (d) If their first child is Rh positive, what is the chance that it will also be elliptocytotic? Le 3) The shape of radishes may be long (II), round (LL) or oval ). Color may be red (RR), white (rr) or purple (Rr). If a long, white strain is crossed with a red, round strain, what phenotypic and genotypic proportions would be expected in the F1 and F2. Write the oenotvpes of the parents as well. Lont half the

Explanation / Answer

BBRR x bbrr

BbRr; black and rough phenotype

BBrr x bbRR

Br          bR

BbRr; black and rough phenotype

Bbrr x bbRr

Br br          bR br

     Br br

bR BbRr bbRr

br Bbrr      bbrr

BBRr x BbRr

Br BR   BR br

          Br      BR

BR   BBRr BBRR

br Bbrr      BbRr

e) BbRr x BbRr

           Br    BR      bR br

Br     BBrr    BBRr    BbRr   Bbrr

BR BBRr    BBRR   BbRR BbRr

bR BbRr    BbRR    bbRR    bbRr

br     Bbrr    BbRr    bbRr bbrr

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