In blood typing, Rh+ or the having the Rh factor (R) is dominant over Rh- lackin

Question

In blood typing, Rh+ or the having the Rh factor (R) is dominant over Rh- lacking the Rh factor (r). Can 2 Rh- parents produce an Rh+ child?

yes

no, the genetics can't work

Sickle cell anemia is a recessive disease in humans. If only one parent carries a recessive allele and the other parent is homozygous dominant, what the probability that a child will have sickle cell anemia?

All or 100%

3/4 or 75%

1/2 or 50%

1/4 or 25%

none or 0%

A woman with AB blood type marries a man with B (whose mother had O blood type)? What possible blood types will their children have?

all AB

all B

A and B

A, B and AB

AB, A, B and O

yes

no, the genetics can't work

Explanation / Answer

Answer:

1). No, the genetics can’t work

Explanation:

rr x rr = rr

2). None or 0%

Explanation:

Ss (carrier) x SS (homozygous dominant)---Parents

S

S

SS (norml-homozygous dominant)

s

Ss (normal-heterozygous dominant)

3). A, B and AB

Explanation:

AB (IAIB) x B(IBi)---Parents

IB

i

IA

IAIB (AB)

IAi (A)

IB

IBIB (B)

IBi (B)

S

S

SS (norml-homozygous dominant)

s

Ss (normal-heterozygous dominant)

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